I'm trying to install an aftermarket ignition system and the coil they sent me has only a 2 wire hook-up (po-neg). I need to know which of the 3 wires off the factory coil wire harness to hook up to where. There is a thin green wire, black and yellow wire and a solid yellow wire on the factory harness. Anybody have any ideas as to what wire goes where, I don't want to hook up the wrong wires and take a chance of burning something up.

 

I can tell you that the coil they supplied you is internally grounded, so the terminals require battery voltage on one side, the distributor signal wire on the other.
The battery side is normally Id'ed with a + (plus) sign.

BUT, without knowing what system you're trying to install (MSD or other) I can't advise you any furthur.
I would think this would have come with an instruction (or at least warning) sheet.
If no one can help here, hopefully you have access to a technical hotline from the manufacturer.

P