Charging Battery on 2005 Jeep While Being Towed Behind Motorhome

Question

Question:

I want to install a stay and play braking system but concerned about draining the Jeeps battery while under tow. My wiring from motorhome to my toad is a 7 wire to a 4 way flat connector. How could I obtain power for a towed battery charger? Would there be ample power from tail lights being I always drive with my headlights on? Or am I forced to rewire everything?

asked by: Joseph S

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Expert Reply:

In order to get power from your motorhome to your 2005 Jeep while you're flat towing you'll need a working 7 way with 12 volts. Since the front of your Jeep has a 4 way flat on it you will need to change out the plug because all 4 wires are being used. The tail light circuit won't have enough power to charge the battery and run the lights on your Jeep, however you won't be forced to rewire everything, just the plug on the front of the Jeep.

If you don't have 12V at the back of the 7 way on your motorhome, you'll need the theRoadmaster Battery Charge Line Kit for Motorhomes # RM-156-75. It hooks to the battery on your motorhome and the 7 way, and provides up to 15 amps to charge your Jeep's battery.

If your tow bar does not have channels for the safety cables and wiring to route through I recommend Roadmaster 7-Wire to 6-Wire Flexo-Coil Kit # RM-146-7. This is a 7 to 6 way coiled cable, and it has the vehicle side connector and bracket.
If your tow bar does have channels I recommend Roadmaster 7-Wire to 6-Wire Straight Cord Kit # RM-98146-7. It's has the same components however this cable is straight so it fits into the channel on the tow bar to keep from dragging the ground.

Something to keep in mind is how you wire the connector on your Jeep, it has to match the 7 way on your motorhome. I included a diagram of how the connector should be wired for the Roadmaster cables, but the terminals are labeled on the back.

Once the 6 way connector is on the front of your Jeep the Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 can be connected to it and the battery This is the easiest most convenient way to make sure your battery is charged while you're towing. There's no extra steps when you're hooking up to tow, your coach will automatically charge the battery if the cable for your lights is hooked up and you're towing.

I linked all the parts and attached a few videos of different year Jeeps we've had in the shop. The installation process is the same for your Jeep though.

expert reply by: Robert C

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Answer 1

Here's how you will know if you would need the brake light relay part #RM88400 on your 2016 Jeep Wrangler with your Invisi Brake system and Hopkins wiring harness. Do the brake lights on your towed car illuminate while the engine is off? No - You…

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Answer 2

Yes the Brake Lite Relay part #RM-88400 does fit with the Hopkins tow bar wiring kit part #HM56200 that you have. This is a required relay solution if you are using supplemental braking that depresses the brake pedal of the vehicle and your…

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Answer 3

The BrakeBuddy Towed Vehicle Battery Charge Kit part #BB54FR comes with a the Brake Buddy Select 3 Portable Supplemental Braking System part #HM39524. I have attached a wiring diagram of how this is setup with the Brake Buddy.

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Answer 4

If your battery is draining in two hours you have a seriously major drain on your battery or your battery is bad. You shouldn't have to pull all these extra fuses to preserve battery life while flat towing. It also sounds like your charge line…

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Answer 5

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part #10-1-1 (sold by the foot),…

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Answer 6

The part #30717 would be exactly what you would need to start with to install a 7-way on your Jeep Wrangler that has a 4-way. You would need to ground the white wire and then run the black wire up to the positive post of the battery using 10 gauge…

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Answer 7

Yes, there is a charge line kit that will eliminate this issue for you. You will need the following items: Roadmaster Battery Charge Line Kit for Motorhomes, part #RM-156-75 Roadmaster Battery Charge Line Kit for Towed Vehicles, part #RM-156-25. The…

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Answer 8

The Blue Ox Patriot part #BLU37TR will draw power from your Jeep battery but there are ways to help keep the battery from draining. The #RM-156-25 is a battery charge line kit that would work well on your Wrangler. I attached an install video for…

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Answer 9

Your 2005 Jeep TJ doesn't need to have the battery disconnected when towing but leaving the key in ACC position will put a very small drain on the battery. To resolve this issue you can install the Roadmaster Battery Charge Line Kit for Towed…

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Answer 10

I have a solution for you, but we do not have a pre-wired adapter to allow you to connect the 6-pin round plug from the tow bar to a 4-pin round plug on your Jeep. One solution is to replace the 4-pin round connector on your jeep with a 6-pin round…

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Answer 11

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 12

The auxiliary 12-volt wire that runs from the 7-way connection to 7-way trailer plug will supply 12-volt power from the vehicle to the trailer. The 12 -volt power will allow interior or exterior lights to run that are not wired in to the…

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Charging Battery on 2005 Jeep While Being Towed Behind Motorhome

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