In Reply to: 12v charging posted by Tim Couch on March 30, 2023 at 13:33:27:
an alternative to the lamp is a 3 amp@50 volt or greater diode. Wire between #1 on alternator and ignition switch with marker band on diode toward alternator.
Or a 10 ohm 10 watt resistor wired as above. With resistor it doesn't matter which end is connected to either side.