charging circuit help please

1. Battery separator switch
2. Breaker on tow vehicle
3. Wire through trailer socket making SURE the negative ground circuit is STOUT
4. Breaker on towed vehicle

Will work like a charm. I recommend 8 gauge wire for this circuit.

Yes if you disconnect the battery the ECU may need to relearn idle, shift strategy and even your driving style.

Jim

I added a charging wire. Ran it from the front of the motorhome to the 7-pin trailer connector. Fused near the motorhome battery, and near the dinghy battery. I use a lighter-socket voltmeter in the dinghy so I can easily see if the power is flowing correctly.

I have tried to disconnect the battery cable and that does keep the battery from discharging. But I am having some problems from time to time with my transmission shifting correctly. Right now it is fine and the transmission shop is telling me that by taking the power off of the computer that the computer may have to relearn my driving habits and shift points and may shift strange for 50 to 100 miles after being disconnected from power. This may or may not be happening. I thought I would add a charging circuit and try it a while and see if the transmission was happier.

Ken

Disconnect the battery negative cable?