Battery/Solar wiring for winch on trailer

[cs641]

I'm installing a winch on my carhauler that gets pulled behind my MH. My carhauler has the standard 7 pin round plug and the dealer told me to tap into the charge wire for the breakaway battery to charge the battery for the winch. I'll also be installing a small solar panel on top of the toolbox to maintain the battery when not in use.


So here's my question. I know I'll have to use the charge controller between the solar panel and winch battery but how do I keep the power in the winch battery from back feeding into the breakaway battery? I'm guessing some sort of diode setup or a relay but not sure.


Thanks!

[M & J]

Battery isolator.

[MotorPro]

Get rid of the breakaway battery and wire it to the winch battery. No need for both.

[Rickf1985]

In some states they require the breakaway battery to be totally separate from any other source.