Is Diode Needed to Prevent Trailer Battery from Backfeeding to Breakaway System

Question

Question:

I have a battery in my trailer that powers my lights inside. When the truck is towing the charge wire runs thru my breakaway system and on to my battery. The problem is when the truck is off my battery in my trailer back feeds and charges my trailer breakaway system. What do I need to prevent this?

asked by: Clay

0

Expert Reply:

Yes, you will want to use a single function diode, like part # RM-690. You will need to wire it in between the breakaway battery and the trailer battery to stop the backfeeding from the battery to the breakaway system.

expert reply by: Leah S

0

Answer 1

The diode #RM-690 can handle up to 120 volts at 24 amps so it should work just fine for your needs provided nothing else exceeds 120 volts at 24 amps. Regarding your picture, most battery chargers or batteries on vehicles say not to ground the…

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Answer 2

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…

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Answer 3

Wire colors alone are not a reliable method for connecting vehicle or trailer wiring since they are not always consistently used. There are common wire colors for certain functions, such as a brown wire for trailer running lights, but there is no…

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Answer 4

You do not need to have a diode between the two 12 volt batteries on your trailer and tow vehicle but it is not a bad idea either. The Roadmaster Single Park Light Diode part #RM-690 will work perfectly for this. The factory 12 volt pin on most 7-way…

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Answer 5

Typically people will let the breakaway battery run the breakaway system and then would use the accessory battery to power the interior lights etc. This tends to work the best since your breakaway battery needs to always be charged and interior…

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Answer 6

The Roadmaster Single Park Light Diode, part #RM-690 can get warm to the touch when it is being used. It is best not to have it mounted inside a covered box along with other wiring to be on the safe side.

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Answer 7

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 8

While unlikely, it is certainly possible that the trailer battery could backfeed to your vehicle's battery when hooked up under the scenario you described. To make sure this doesn't happen all you need to do is add a single diode like the…

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Answer 9

If you want the loading lights on the trailer to function with both the switch and batteries as well as off of the reverse light circuit from a 7-Way trailer connector you can certainly make that happen. But instead of the reverse light circuit wired…

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Answer 10

Diodes like the part #RM-790 only allow current to flow in one direction. Usually a diode is a small cylindrical shaped component (not in this case) which has two leads on it, the anode and the cathode. When the anode side of the diode is facing…

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Answer 11

The charging circuit on a vehicle 7-way style connector, the one that would deliver a maintenance charge to the trailer battery while you tow, is completely separate from the 4-wire brake controller wiring. This trailer charging circuit is usually…

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Answer 12

The diode part #RM-690 that you referenced would be perfect for what you are looking to do. It will allow current to go from the one battery to other but not in the other direction. Basically you just need to install it between the two batteries with…

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Is Diode Needed to Prevent Trailer Battery from Backfeeding to Breakaway System

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