This is from the Tech Tips section on the GMC conversion. (Credit to Patrick's catalog)
Disconnect the battery (VERY important first step)
Reverse the wires on the coil
Reverse the wires on the ammeter
Reverse the battery cables. While you're at it, why not switch the ground cable from going to the frame to a starter mounting bolt or the transmission? It's better than the frame.
Put all your tools away and sweep the garage floor, because you are DONE. Oh, yeah. Power up the system to see if you did it right.
