Join Date: Dec 2010
Location: Santa Barbara, CA
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Are you talking about the large gauge "feed" wire, or the smaller wire that "activates" the relay?
Here's an update to my situation... Hopefully this doesn't turn into one of those "why you should pay a professional to do it right" kinds of threads....
I started testing voltages and noticed that one of the two small wires to the GPR was getting voltage when the key was turned to the "run" position (when the GPs should be warming up). It wasn't turning off after the light in the dash did, but I'm not sure about whether that light is "smart" or not (or just a dumb timer that isn't actually aware of the GP voltage status).
"Aha" I thought - the PO must have installed the relay with these wires crossed up. So I reversed them (putting on on the "I" terminal and the other on the "S" terminal on the opposite positions that they'd been.
I pulled the terminal plug to the GPs and turned on the key to the "start" position and checked the voltage to the GPs via the terminal connector. Sure enough, I was getting voltage!
So, I plugged the connecter back in, put away the tools and fired up the truck. It started easily, since now the GPs were getting hot.
I ran her around the block to warm up the engine, planning to check to make sure the GP relay had shut off by the time the engine was warmed up.
Well, I got about 1/2 a block down the street and the truck wouldn't shift for a looong time then WHAM! it shifted hard, then shift back. Suddenly the truck is running like CRAP and I notice the "OFF" light on the overdrive button is flashing.
So much for that idea...
I pulled back into the driveway and switched the wires back to their original position and took her back out for another drive around the block. Unfortunately, the problem is still there - shifting VERY rough and running very poorly while flashing the "Overdrive Off" button.
Now I'm wondering if somehow I fried the PCM by swapping the wires....