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

Updated 11/21/2013 | Published 11/20/2013

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Question:

Just installed. Trailer is in garage hooked to nothing. When I attached ground wire the yellow charging light went on. I waited one hour hoping it would go off but it hasnt. My question to you is this Since this is a tilt trailer with a battery electric powers hydraulics will this light stay on all the time? If so, how do I make it so this doesnt stay on without disconnecting ground each time I unhook trailer Thanks

asked by: Donnie

Expert Reply:

It sounds like the tilt 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