My brand new alternator on my 4.3 Chevy swap wont charge. I have a Howell wiring harness for this swap. It has a wire that says 12Vdc lamp to sw12. I am assuming this needs to have a 12 volt light connected to a 12v light and then to a switched terminal to sense voltage and excite the alternator. Should this be on the start or run side of the ignition switch or another place? Must I wire in a light? Does it require the resistance?