Quote:
...The rest WAS the ground problem; we think the ground wire to the four-way plug is maybe bad.
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A typical four-way to seven-way adapter does not use the white wire of the four-way; only the three power connections (tail,left,right) go from the four-way to the seven-way, and a separate white wire is used. If you were expecting the adapter to get it's "ground" connection via the four-way, it likely wouldn't work.
These adapters use a separate white-wire connection because the wires and contacts in the four-way system are too small to handle the current requirements of
battery charging and electric
brakes, which are supported by the seven-way connectors.
I use one of these adapters. I crimped a ring terminal on the adapter's white wire and bolted it through a mounting tab on the hitch receiver, where I also terminated a white wire which goes directly to the van's
battery (negative post). The van's body and my added wire both provide paths back to the
battery; the four-way connector is not involved.