Trace the odd cable and see where it goes. If it doesnt go to ground,
then it fits at the positive (red) terminal. IIRC, on my GM cars, there
was only one negative cable and it went to ground, but I wouldnt bet
my pet orangutan on it.
The triple terminal, again IIRC, went to positive. Those cables were
known for corrosion problems, and therefore electrical problems, inside
the connector terminal.
Glad to try to help.
You probably need to replace that positive cable, by the way. I have
pulled the terminal rubber down, tried to clean them, etc, but when they
go bad, the best cure is to replace with either good aftermarket, OEM,
or custom cables.
I had some custom cables made for my Reatta that are the best I have ever
seen, and the price was reasonable.
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