Diode Recommendation to Prevent Trailer Battery From Backfeeding onto Vehicle Wiring

Question

Question:

Im not sure if this is the correct item for what I want to do. I want to install a battery in my cargo trailer to power the interior lights. My plan is to locate and cut the constant 12 volt from my vehicle and attach it to one side of the solenoid. Then attach the other wire to the other side of the solenoid. Them I will attach the positive from my new trailer battery to the third side of the solenoid. Does this sound correct? I dont want the trailer battery to back feed my vehicle.

asked by: John R

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Expert Reply:

If all you want is to prevent the 12 volt power supply of your trailer battery wiring from backfeeding onto your vehicle wiring or vice versa what you need is a one-way diode like part # RM-690. This only allows current to flow in one direction so you'd just need to install it inline with your trailer wiring matching the in and outside to your setup and you'd be good.

expert reply by: Jameson C

0

Answer 1

The closest thing we have is the installation of the #RM-8700 on a 2014 Wrangler which I attached below. Although it isn't exactly the same you can use it as a general reference coupled with the written instructions.

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Answer 2

If you wanted to prevent the 12 volt trailer wiring circuit from backfeeding when connected to your trailer's battery you'd have to use a diode like the part #RM-690. This will only allow the current to flow in one direction.

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Answer 3

The diode that you want for your charging line from your Motorhome to your towed vehicle (Toad) is the Roadmaster Single Park Light Diode #RM-690. This diode will allow up to 85 amps at 12V and will only allow power to flow in one direction to…

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Answer 4

It sounds like you have a charge line ran from the RV's battery to the trailer's battery. If this is the case then yes, you will need a current limiter (circuit breaker) in between the two in order to prevent any spikes that could in turn…

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Answer 5

To replace your Iota IDP-240 you'll want to use the Progressive Dynamics RV Power Control Center with AC/DC Panel and Converter/Smart Charger #PD4560K18LS8. This panel is rated for 50 amp service, can provide both 120v/240v and is compatible with…

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Answer 6

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 7

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 8

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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Answer 9

I have another option for you but the Replacement Fabric for Roadmaster Tow Defender Screen for Blue Ox Tow Bars #RM-4750-10 you were looking at is only a confirmed replacement for the Roadmaster Tow Defender Protective Screening #RM-4750 and is not…

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Answer 10

Since you have a hard vacuum line on your 21' Ford Expedition you'd want the Demco Vacuum Connection Tee Fitting #DM6257 when installing the Demco Air Force One #SM99209.

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Answer 11

The best way to power the interior lights in your trailer is with its own independent battery. You will not want to use the breakaway battery. The breakaway battery is only designed to operate the breakaway and will drain extremely quickly,…

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Answer 12

I'd be happy to help! The Demco Air Force One Supplemental Braking System #DM26VR uses a 10 Amp ATC fuse according to their parts list. This is just a standard fuse that you can find locally or in our Standard Fuse Kit #PT52FR.

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Diode Recommendation to Prevent Trailer Battery From Backfeeding onto Vehicle Wiring

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