How to Wire Up a Breakaway Battery and an Auxiliary Battery on a Trailer without Backfeeding

Published 02/25/2015

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Question:

I purchased this break a way controller after finding out my original one was no good and installed it according to the manufacturers instructions. Trailer is a Platinum Coach gooseneck horse trailer with living quarters. The charging indicator LED light stays lit when not plugged into tow vehicle. Im sure it is coming from the backfeed of the house batteries as the wire I spliced into charges the house batteries when plugged into tow vehicle. How or what can I use to stop the backfeed from the house batteries but still allow them and the break a way battery to charge when plugged into tow vehicle? Thenks!

asked by: Loren

Helpful Expert Reply:

It sounds like the house battery is backfeeding onto the breakaway battery charge line so as long as the ground is connecting it is taking a charge from the tilt battery and that is why your charge light is staying on.

I have a solution for you, you will need a single function diode part # RM-690. You will need to wire it in between the breakaway battery and the tilt battery and it will stop the backfeeding from your tilt battery to the rest of the 12 volt circuit wiring of your trailer.

Check out the diagram I put together to show you how it should all get wired up.

expert reply by: Jameson C