Percolation? Heat soak? Don't drive during summer??

DentalDart said
Fixed the buzzing coil... it was from this green wire that runs to the tach on top of the steering wheel. It was hooked up on the negative side of the coil. It runs with the black wire to the back of the tach. Im assuming it is a ground wire? But why hooked up on the coil?

Haven't started the car yet, as its to late and the kids are going to be going to bed soon. Hopefully i get home at a reasonable time tomorrow and can mess with some stuff. Does anyone know where this ground goes? Its never been hooked up on my car, but I put the green wire under it to keep it out of the way...

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The black wire is an engine/Chassis ground. I'd bolt it under one of the coil bracket bolts, but am not sure where the factory connected it.

That green wire - you put it under the black wire now, but it wasn't there before right? I'd trace that green wire back and I bet it has a chafed spot in the insulation. I'd pull it all the way into the cab and check every inch of that wire before thinking of hooking it up again.