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Yeah, then we'd need a relay to protect the relay, and a relay to protect the relay that protects the relay... :roll: Well, well, well. Under-spec'd parts. Why, I am just shocked! Shocked, I tell you! :mrgreen: Well, we did have a strong potential for a bit of reverse voltage a while...

Yes, I've gotten another picture and confirmed that it is the ground trace. Yes, I'm aware of how it works. There's only one thing that would cause a conductor to overheat, and that's too much current. This looks to me like a previous repair, and I have heard more than one similar failure...

Well, it seems my GP controller card has died. I haven't yet double checked to make sure the blue wire is still good, but if that checks out, it's the card. I'm a little handicapped on working on it, since I have a busted knee at the moment. I had a 55mph encounter with a 90s-era Suburban...