Re: Trailer winch battery wiring

Posted by John T on June 10, 2022 at 06:41:20 from (45.16.200.171):

In Reply to: Re: Trailer winch battery wiring posted by Gene Davis (Ga.) on June 10, 2022 at 06:04:40:

Good questions:

1) If I used the idea from John T for a relay, where would the relay pick up its turn on power from?

One place FOR THE POWER would be direct off the truck battery POS terminal protected with the proper size fuse or breaker. The relay power output would connect to the charge wire circuit back to the trucks 7 pin connector terminal

One place for the PICK UP OR ENGAGE OR SIGNAL to activate the relay I CANT SAY WITHOUT A SCHEMATIC but a location that turns hot ONLY when the truck is running or key is on could suffice to activate the relay. Maybe some Ford owner can tell you the location SORRY I dont know

2) Would it connect to the charging feed wire just before it connected to the winch battery?

Above I was talking about the POWER feed from the TRUCK battery for the relay...At the winch battery you just need overcurrent protection for the charge wire circuit. I envision the relay up at the truck battery and when its activated the charge wire circuit goes to the trucks 7 pin connector then the trailers connector then the trailer battery via a circuit breaker.

3) Or if a diode is better, what size diode would be needed?

A diode rated for 50 amps (depends on charge circuit max amps) at least 50 or 100 volts should suffice. If its used (instead of a relay) in the charge wire circuit from truck battery back to trailer battery if wired correct it lets charging current flow to trailer battery but NOT allow discharge. There is a 0.6 or so voltage drop across the diode but a long wire run back can also cause a voltage drop. These type of charge wire circuits are for lower current to charge or trickle charge the trailer when driving NOT so much to power the winch. A simple inline diode is soooooooo much easier to allow charging but not reverse discharge

4) Also there are no back up lights on the trailer. If I have the truck running while using the winch will the truck system be in danger?

The trucks battery and alternator and the charge wire feed back to the trailer is current limited by the size of the circuit breaker be it a 20 or 30 amp etc

See how the other fine gents do this What I posted is NOT the only way to do this but how Ive done it. THERES MORE THEN ONE OR MY WAY TO SKIN THIS CAT LOL

John T

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