Roadmaster Battery Charge Line Kit for Motorhomes
(91 reviews)
Price: $62.58
In Stock
Roadmaster Battery Charge Line Kit for Motorhomes
Item # RM-156-75
Retail:$76.13
Our Price: $62.58
You Save: 18%
In Stock
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
Need help with installation?
Locate installers near me- All Info
- Reviews (91)
- Q & A (0)
- Videos (12)
- Photos
Roadmaster Accessories and Parts - RM-156-75
- Tow Bar Wiring
- Battery Charge Line Kit
- Roadmaster
This charge line connects to the battery in your RV to allow up to 15 amps to be transferred to your towed vehicle's battery during towing. Requires RM-156-25 be installed in towed car.
Features:
- Allows power from your RV's battery to be used to maintain the charge of your towed vehicle's battery while the car is being towed
- Transfers just 15 amps to avoid overcharging the car's battery
- Connects battery to 6-way or 7-way plug at the rear of your RV
- Requires Roadmaster's vehicle battery line (RM-156-25 - sold separately) if no charge line is present in your towed vehicle
- Includes 12-gauge wire, split wire loom, circuit breaker, and hardware
- Made in the USA
156-75 Roadmaster Battery Charge Line Kit for Motorhomes
Installation Details
Video of Roadmaster Battery Charge Line Kit for Motorhomes
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Video Transcript for Roadmaster Battery Charge Line Kit for Motor Homes Installation - 2022 Jeep Wrangler Unlimited
Instructor Hi there, Jeep owners. Today, your 2022 Jeep Wrangler Unlimited, we're gonna be taking a look at and showing you how to install Road Masters Charge Line Kit. Now, we are using the charge line kit for motor homes on our Jeep here because the connector for our six-way is so far away from our battery and connections here and all the pathways that we have to take to get there. The regular towed vehicle kit is too short to make the run up to the connector. Now, that may vary depending on your base plate. We're using Road Masters Direct Connect, which positions the connector off towards the driver's side, which makes it further away.
If you had a different one or mounted your own connector further towards the passenger side, you might be okay with the regular vehicle kit. The charge line kit will include the wiring you need to connect to your six-way connector at the front, go to the circuit breaker that you see here, and then go to our battery. This way when we plug into our motor home, we're flat towing down the road, the alternator on our motor home it's just the regular charging system on the motor home will also charge the battery here on our vehicle. And it is just gonna be a trickle charge, but that way it'll just ensure that it's maintained 'cause as you're going on long trips and your breaking system's activating things like that it's gonna drain your battery a little bit. This will ensure that it stays topped up, so when you get to your destination your vehicle's able to start and you can enjoy your fun without having to bust out chargers and find jumper cables and anything else like that.
And now we've covered some of the features of our charge line kit, why don't you follow along with me and we'll show you how to get it hooked up. We'll begin our installation here underneath the hood. In your charge line kit, you'll receive a circuit breaker. We're gonna try to find a location near our battery to mount it. And this is a pretty good spot here.
There's just enough room between your fuse box cover here that you can still get the fuse box cover off and mount the circuit breaker in this location. So, we mounted it right here using the two self-tapping screws that come provided in the kit. You'll notice you have two posts on your circuit breaker here. The bronze post is the battery post and the silver post is your auxiliary or load post. We hook this up kind of backwards in a charge line circuit.
Normally, you'd hook the bronze one to your battery, but in this case, our battery's actually the load 'cause we're trying to charge our battery with our source being the motor home. So, the motor homes charge circuit is gonna connect to the bronze. So, the wiring that comes in your kit, we're gonna route from the bronze stud here up and we go down and then we just go across to where our six-way connector that we're gonna mount here at the front is. And you might be wondering, well, hey, this is a a motor home kit that you're installing. And the reason why we're using a motor home kit in our vehicle instead of a vehicle kit, is because of the distance that the battery is from where our six-way connector. The bracket for our six-way connector comes provided with our base plate and it's got its own mounting location and it's pretty far from here, so the regular vehicle kit doesn't reach from the battery all the way up to there. So, we're using a motor home kit, which honestly is gonna be better for the customer anyway. You get extra wire in there or more than you're gonna need to do this install. It's a thicker gauge wire than comes in the regular vehicle kit. So, that can help give you just a slight bit more voltage here at your battery. From your motor home, there'll be a little bit less of a voltage drop. And with that extra wire you can use it for other things in your install. We ended up using part of that wire for our breaking system install. So, it was nice having some extra wire left over. So, we've got our wire routed now to both connections, to both ends. It just stays bare up at our six-way end and we'll hook it up up there. Back here on our circuit breaker end, you're gonna just crimp on just strip it back and crimp on one of these small ring terminals that come into your kit. And I use the entire wiring harness routed from here down there. I pull my slack through and then I cut it up there at the front, leaving myself a little bit, so I can connect to the connector. The rest of the wiring that I bring back up here, I attach a ring terminal the same small one to the other end of my wire here and then I attach it here to the silver post. This one's gonna go to the battery. I haven't hooked it up yet. I recommend that you cut your length that you're gonna need here to connect your battery. I gave myself a little more excess than I'm gonna need, so I'll trim that down more. But don't hook it up to your battery just yet. This is where you wanna stop hooking it up to the battery and go down to your six-way connector and we'll make our connection down there. Alright. And lastly, we've got our center pin here. Slide our charge line into there and then tighten this one down. So, now that we have all of our connections made, we're gonna use a generous amount of dialectic grease to seal this up and prevent any corrosion. Slide your dust boot into place and then we can mount up our connector. Our connector is gonna mount to using the hardware that came provided with our base plate for mounting it into this bracket here. So, we're just gonna use that hardware, slide it through our connector, through our bracket, and then place the nut on the other side. We'll do the same thing with the other side of our connector here. Alright, now that we've got all those started, we can go ahead and zip those down. And we're just gonna use a 10 millimeter wrench to hold the nut on the backside and our Phillips To snug it down. Alright. Now that we've got hooked up to the six-way connector, we can come back up to our battery. The reason we didn't hook it up, so we don't accidentally cause any shorts. If this isn't a hook to a power source there's no chance we can cause any shorts. So, we've completed the rest of the wiring, so we know that there's no way that there's any loose wires hanging down there that are gonna cause shorts. This hooks up the way it's supposed to be. So, now we're gonna come to our battery here. We'll go ahead and route that wire that's coming from the silver post over to the positive here and just pull back on this. I'm just gonna stick my wire just kind of like underneath here, this little open slot. That looks like a pretty good pretty good amount of wire right there. So then, we're gonna trim off excess that we don't need. And we will strip this wire back. This wire is going to get the slightly larger ring terminal that comes in your kit. This one has a bigger opening compared to these smaller ones for up into your circuit breaker. This one's designed to be able to hook to a battery. So, just slide that guy on there, crimp it down, and then we can make our connection at our battery here. So, just pull back on this, so you can choose whichever post you want. We're gonna use the small one here just because these posts- the ring terminal does fit over these posts. So again, you could go over one of those if you wanted to. And actually I think we will. This looks like this particular stud right here does not have any wiring hook to it. So, it's just a free stud for us to use. So, we'll utilize that for our accessories. So, I just went ahead and took the wire and poked it through the opening there that way it'll stay kind of hidden underneath our cover here. Just poked it through the opening. We'll use a 12 millimeter socket to remove the nut from this location, slide our ring terminal in place, and then reinstall our nut. And then you can just slide your cover back into position and that will complete your charge line installation. And that completes our installation of Road Masters Charge Line Kit on our 2022 Jeep Wrangler Unlimited..
Customer Satisfaction Score:
88% were satisfied with this product
12% of customers were not satisfied
- Wrong item was ordered
- Product did not meet expectations
- etrailer mistake
Customer Reviews
Roadmaster Battery Charge Line Kit for Motorhomes - RM-156-75
Average Customer Rating: 4.6 out of 5 stars (91 Customer Reviews)
This charge line connects to the battery in your RV to allow up to 15 amps to be transferred to your towed vehicle's battery during towing. Requires RM-156-25 be installed in towed car.by: Mark06/12/2023
While I generally have high praise for Roadmaster and etrailer products, other than their poor instructions from Roadmaster for the DIY customers, this product is a total rip off. The wire to do my 35 foot RV was easily 10 to 15 feet too short to do it. I had to go purchase separate wire to do the job. The 15 amp 12 volt DC circuit breaker sells for $3.53 online by itself. The connectors and zip ties equate to an additional $1.00 max. So I paid $50 for less than $5 worth of usable kit parts. Shame on Roadmaster and e-trailer for gauging customers on this kit. The same applies to the charge line kit for the towed vehicle. Price gauging on the “fast food soda” after spending over $3000 in other parts for flat towing. For this price they could have easily included a full 50 foot spool of wire to work on any RV. Shameful.
by: Peter 102/10/2023
I installed this kit along with other kits from ETRAILER for towing my Chevy Equinox with 4 wheels on the ground, using my motorhome. The parts are of good quality. I reviewed the instructions and videos many times prior to working on my own vehicle, along with a phone call to the help desk. I recommend having had prior training with electrical wiring systems. This kit provides 12 volts via the motorhome batteries but at a high amperage rating. Be safe and double check your work.
by: Mark02/10/2024
To much money for a relay and some wire
by: Michael06/26/2023
Simple installation. Very good instructions from Demco.
by: Dan08/07/2023
Have to restart car every three hours ? Would go almost that long without any charger at all. Suggest your company locate another supplier with a stronger model as I have seen on other units in campgrounds.
by: Larry B09/18/2019
This is also a part i ordered for my tow behind car in order to charge the battery while pulling the car with the A class motor home on a long trip. The item is just what was described on the internet site. I haven't installed this item yet but it seems to be easily done with the instructions provided. I have ordered from Etrailer many time before and have always recieved great help from customer service and their whole crew. I will continue to do business with them in the future.
Sincerely,
larry Brauer
by: Steve03/25/2022
These were exactly what I needed. I changed tow vehicles to a Honda HRV (manual) and the only base plate available was the Roadmaster. These adapters took about 10 minutes to change my Blue Ox tow bar to accept the Roadmaster.
by: Kevin 09/18/2023
Great service
by: John08/25/2022
Quality of the product seems fine ..
My issue is the 30 feet of wire included in the kit… Is this supposed to be a length sufficient to wire most RVs? How many 25’ RVs are capable of pulling a tow vehicle?
My RV is 38’ 10”… Because the wire included is worthless I was forced to purchase a 100’ roll (couldn’t find a 50’ roll) for $35.00…! Almost what I paid for the kit…. Bummer..
by: Gary S.08/16/2017
This base plate was relatively easy to install (if you're handy and can follow written & video instructions), and is practically invisible when not being used for towing. Everyone at etrailer were helpful and knew exactly which parts were needed, even a year later when I asked about using the same base plate on a newer vehicle. The picture is just after install on my 2017 C-Max.
by: John05/31/2023
Excellent customer service I needed some information on my order. I emailed asking for it and got the information within a couple of hours.
by: Kenneth 11/24/2019
Roadmaster Battery Charge Line Kit for Motorhomes
Item # RM-156-75
Easy install, but suggest that the 12 gauge wire supplied was longer,or had a description as to the length on your website as it was too short for my 30ft MH. I had to purchase additional to complete the job. Otherwise, works like fine, and good price. Thanks, it should save my battery on my Equinox 2018 when towing.
by: Melanie09/23/2019
Nice kit as expected, Plenty of hardware and hook-up wire for our 2015 Dodge Dart. Would be nice to include $5 of snap on Red cover in the kit to help protect the hot leads.
by: Garnett08/23/2019
Ordered 3 parts: RM-156-25; RM-156-75 and DW05745-10. All received very quickly, as is the case when I purchase from etrailer. More importantly, I get a 'live person' when I call for assistance and the service rep. is always knowledgable ( not an answering service that "will have someone call back". Time was spent with me answering all my questions and providing suggestions and opinions when I as for them, related to my project. Great company, great service - keep up the great work!
by: Charles06/16/2018
The battery charged kit connected on to our motorhome to charge the battery of our jeep has worked excellent and the installation also was an excellent job we are very happy with our installation.
by: Jeff E.06/06/2019
Would highly recommend using etrailer for any trailer accessories that are needed. Very friendly staff and shipping is fast and accurate on delivery.
by: Bill11/15/2021
Works great and allows me to tow with vehicle stability turned on; no more death wobble! Installation instructions were clear and it fit perfectly.
by: Michael 02/18/2023
no problems.great product
by: Michael 02/20/2023
Quick and efficient response and delivery of product ordered!
by: Walt K01/02/2019
Installed in my motorhome, works great easy to install following instructions provides. No more dead battery in the toad.
by: Jerry P09/26/2020
Works well. Keeps the battery charged in my tow rig.
by: Gelatoman08/30/2019
2015 Jeep Wrangler Rubicon Unlimited...kit was complete and easy to install. Still installed and working one year later!
by: Pat 08/26/2021
It was very simple to install
Pat
8/27/2022
Great
by: Jeremy 11/08/2022
Does exactly what it is supposed to.
by: Daniel05/07/2019
Very easy to install. Everything needed is included.
Daniel
5/8/2020
After a year of using roadmaster nameplates and the electronic components to pull my 2019 jeep Cherokee I have been completely satisfied and have had no problems. I installed everything myself with help from etrailer staff and videos.
25
90
Show More Reviews
See what our Experts say about this Roadmaster Accessories and Parts
- What Scenario Is the Roadmaster Battery Charge Line Kit # RM-156-75 Designed to Work InThe Roadmaster Battery Charge Line Kit # RM-156-75 and products similar to it are designed to keep the battery of the toad vehicle topped off while being flat towed. Typically supplemental braking system draw power from the battery of the tow vehicle to operate which since it's turned off does not have the alternator keeping it charged. These kits are not designed to work in the scenario you described which is almost in reverse. If your concern is batteries getting drained when parked...
view full answer... - Is It Okay To Run Battery Charge Line Circuit for 7-Way Inside VehicleIn order to add the battery charge line circuit on a 7-way trailer connector you can use the Roadmaster Battery Charge Line Kit part # RM-156-75 which comes with everything you need and most likely more wire than you'll actually need. In regards to the exact route you must take, there really isn't a set in stone way, whichever works best for your particular application. The important thing to note is to stay clear of moving parts or heat. If the inside of the vehicle works best for your...
view full answer... - Installation of Roadmaster Charge Line Kit on 2014 Ford Edge and RV For Flat TowingTypically when a 7 way is installed initially on a tow vehicle the reverse light circuit is on the center pin. When you're installing the Roadmaster Charge Line Kit for Motorhomes # RM-156-75 you're going to want to install it on the center pin where the reverse light circuit previously was- you'll want to cut that wire completely off and wire in the new wiring directly.
view full answer... - Charge Circuit of 2020 Newmar Bay Star for Flat Towed VehicleAssuming that wire you found is a 12 volt circuit that is fuse protected like you mentioned you certainly could use it to charge the tow vehicle with the # RM-156-75. You should note that the charge circuit of a 7-way is actually the 1:00 pin of the connector as you are facing it.
view full answer... - How to Connect 12V Power Wire to Trailer Connector at Back of Fleetwood MotorhomeYou'll want to add your charge wire, like what comes with the Battery Charge Line Kit for Motorhomes # RM-156-75, to the wire socket at the back of your motorhome. If you have a 6-Way socket then you'll wire it to the middle pin but if you have a 7-Way you'll wire it to the pin in the 1 o'clock position (see photo). So this wire will run from the positive side of your motorhome battery to the socket. Once you have it ran and the auto reset breaker in place you'll be good to go! Attached...
view full answer...
- How To Send Constant Power to 12 Volt Pin On Trailer Connector On 2020 Ford F-350The best solution as you alluded to is to bypass the factory "Smart Tow" trailer package which is what is responsible for only sending power to the 12 volt pin when the vehicle is in gear. This is actually pretty easy to do and we have a kit which will have everything you need to do so, the Roadmaster Battery Charge Line Kit for Motorhomes part # RM-156-75. In order to install this kit simply attach one of the wire leads to the battery and then to the circuit breaker. Once this is done,...
view full answer... - How To Turn On 12 Volt Charging System On 2017 Ford F-250 with Truck Bed CamperThe best option we can offer to get the battery charge line circuit operational on a 2017 Ford F-250 with truck bed camper would be to bypass the factory circuit so you can send pull power to this at all times. This can be done with the Roadmaster Battery Charge Line Kit part # RM-156-75.
view full answer... - Will Starting Vehicle with Roadmaster Battery Charge Line Kit # RM-156-75 Connected Damage AnythingYou would not need to worry about damage occurring if you started your vehicle with the Roadmaster Battery Charge Line Kit # RM-156-75 installed. There would be no need for a diode either. Having an additional 12 volt power source attached to your vehicle while it's running would essentially just be like having a more powerful alternator. Basically it would just be like having more amps present which would not hurt anything.
view full answer... - Full 12 Volts Not Reaching Roadmaster Battery Charge Line Kit for Towed Vehicle I am not sure if you have already tested the battery charge line circuit on the motorhome's 7-way but if not this will be your next step. If you don't get 12 volts here then there is an issue with this circuit on your motorhome. Aside from tracing the wire back I don't have much to resolve this issue so easiest option would be to just run your own wire with the Roadmaster Battery Charge Line Kit for Motorhomes part # RM-156-75. If you do get 12 volts on the battery charge line circuit on...
view full answer... - Length of Roadmaster Battery Charge Line Kit for MotorhomesThe Roadmaster Battery Charge Line for Motorhomes part # RM-156-75 is 30 feet long. It Includes 12-gauge wire, split wire loom, circuit breaker, and hardware
view full answer... - How To Run a Trailer Battery Charge Line on a 2018 Ford F-150If the circuit for the 12 volt power to the trailer connector is not present on your 2018 Ford F-150 then you can easily run this yourself using the Roadmaster Battery Charge Line Kit part # RM-156-75. This kit would attach to the 12 volt power wire on the back of your connector and then it would get run up to the vehicle's battery. I have personally not heard of this issue before but if the dealer said the circuit was not present then I would proceed assuming this is correct. I however...
view full answer... - Troubleshooting Trailer Taillight that isn't As Bright as Other SideNormally with this type of problem the issue is that the weak light has a weak ground which is why it isn't lighting up all the way. See if you can improve the ground of the weaker light and see if that fixes the problem. Since the brake lights draw more current that would also line up with yours not working at all.
view full answer... - Can the Roadmaster Battery Charge Line Kit for Motorhomes Be Hooked Up To Power Distribution CenterThe Roadmaster Battery Charge Line Kit for Motorhomes part # RM-156-75 simply requires a power source capable of drawing 15 amps so whether you are hooked up directly to the battery or the power distribution center which is fed from the battery it should not matter. The rule about being six inches from the battery is in reference to the circuit protection but the power distribution center will still follow this standard.
view full answer... - Where is the 12 Volt Trailer Tow Battery Fuse For the 7-Way on a 2016 Ford F-53 ChassisI looked through the owner's manual as well as some wiring schematic for your 2016 Ford F-53 chassis and there is no mention of a 12 volt trailer tow battery feed. After some additional research online it seems as if this circuit was excluded from the F-53 chassis but I am sure the dealer would be able to give you a definitive answer. With that being said, it may be best for you to just run your own charge line from the coach battery to your 7-way. This can be done with the Roadmaster Battery...
view full answer... - Does Fuse of 2014 Honda CR-V Have to Be Removed When Flat Towing Even With Charge WireOur # RM-156-75 which is used to charge a tow vehicle's battery when being flat towed wouldn't be enough to leave the fuse left in your 2014 Honda CR-V. Some of the depletion of the charge might be offset, but in the end you always have to go by what the manufacturer of the vehicle recommends.
view full answer... - Charge LIne Kit For Motorhome to Charge Supplemental Braking SystemWe have come across this, and we do have a part to get a charge line for your motorhome to get power from your 7-way: - Roadmaster Battery Charge Line Kit for Motorhomes # RM-156-75
view full answer... - Recommended Roadmaster Battery Charge Line Kit for Towed Vehicles Amperage Transfer at 12VIt is very normal for the 12V charge line on a vehicle to provide only the voltage that is being provided by the alternator that is not being used by the vehicle itself. The 3.5 volts is not normal but just 3.5 amps would be normal when the vehicle is running. If you want the full 12V power, then you will need to run the # RM-156-75 which will give you 12 gauge wire and allow you to transfer 15 amps to avoid overcharging your Jeep battery.
view full answer... - Recommended Charge Line for a 2020 Jeep Wrangler JL A charge line is definitely what you need to keep your Wrangler's battery from dying on long trips. I recommend the Roadmaster Battery Charge Line Kit for Towed Vehicles item # RM-156-25. This charge line connects to the 6-way or 7-way plug on your Jeep. If your Thor Outlaw's 7-way connector does not have a functioning charging circuit you will also need the Roadmaster Battery Charge Line Kit for Motorhomes item # RM-156-75. I have linked a couple of installation videos below so you...
view full answer... - Vehicle and Motorhome 12V Charge Line KitsYou can use Roadmaster Battery Charge Line Kit for Towed Vehicles Item # RM-156-25 for your 2017 Jeep Wrangler Unlimited. If there is no charge line on your RV then you will also need the motorhome side kit # RM-156-75.
view full answer... - Charge Line Kit Recommendation for 2010 Buick Enclave Getting Flat Towed to Keep Battery Topped OffYes, as far as a charge line kit goes for your 2010 Buick Enclave the Roadmaster kit part # RM-156-25 is your best and simplest solution. Basically it connects to the 12 volt accessory circuit of your trailer wiring and gives you a trickle charge to offset the draw of your Brake Buddy system. It will be enough to keep the battery working properly. I attached a couple install videos for this as well. If the trailer wiring accessory circuit on your tow vehicle is not active you'll also need...
view full answer... - Recommended Solution for Adding Charge Line for Flat Towed VehicleIt sounds like you're looking for the Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25, which will allow you to keep the battery on your 2005 Jeep TJ charged; this will tie into the 7 way tow bar wiring/light kit you've got. If you don't have a charge line on your RV's 7 way then you'll also need the Roadmaster Battery Charge Line Kit for Motorhomes # RM-156-75. I've linked some review and installation videos of these parts for you to check out.
view full answer... - When Is Roadmaster Charge Line Kit # RM-156-75 Needed When Using # RM-156-25The Roadmaster Charge Kit part # RM-156-25 is designed to tap into the 12 volt power circuit that's carried from the tow vehicle to the towed vehicle through the wiring used for the lighting. If the trailer wiring at the rear of your 2013 Thor Palazzo already has the 12 volt circuit active then you would not need to use the # RM-156-75 but if it does not then you would need this kit as it comes with extra wire to run from the motor to the connector.
view full answer... - Does Roadmaster Battery Charge Line Kit Connect Straight to Battery on MotorhomeThe Roadmaster Battery Charge Line Kit for Motorhomes # RM-156-75 connects directly to the battery on your motorhome though it is wired through a circuit breaker, which comes with the kit. Please keep in mind you will need Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 if the vehicle you are flat towing does not have a charge line.
view full answer... - Recommended Solution to Keep 2016 Ford Fiesta Battery Charged During Flat TowingIt sounds like your supplemental braking system is probably draining the battery, and each vehicle has it's own flat towing processes that need to be followed. I can't say that I would recommend flat towing with the vehicle running but you can add a charge line to your vehicle with the Roadmaster Charge Line Kit for Towed Vehicles # RM-156-25. This will allow you to use the charge line on your RV's 7 way connector to charge your battery during travel. If you don't have a charge line on...
view full answer...
Do you have a question about this Accessories and Part?
Info for this part was:
Video by:
Joe V
Video by:
Kathleen M
Video by:
Jonathan Y
Video by:
Ethan H
Expert Research:
Mike L
Expert Research:
Jameson C
Edited by:
Lindsey S
Installed by:
Jeff D
Video Edited:
Joshua S
Video Edited:
Jacob T
Video Edited:
Dustin K
Video Edited:
Chris R
Video Edited:
Zach D
Test Fit:
Randy B
Test Fit:
Brent H
Test Fit:
Shane H
Test Fit:
Robert C
Test Fit:
David F
Test Fit:
John A
Written by:
Shelly K
Updated by:
Wilson B
Updated by:
Matthew E
Updated by:
Isabelle B
Updated by:
Noah M
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Larry B.
9/20/2020
Working great with no problems great product