ClassicCar

Okay, I made my own wiring harness years ago and it has served me well. I put in a fuse box originally wherein I fused each line from to old wiring harness to the lights, interior lights, ignition, heater, clock, radio, etc. No problem. Over the years, I switched to 12 volts, no problem initially. I have since added air conditioning, a high speed radiator fan, and attached those accessories to another fuse block which is wired to the accessory line on the ignition switch. A while back the generator light came on and wouldn't go off. I bought a new alternator and the light still stayed on. The alternator is working properly (there was nothing wrong with the old alternator according to my starter repair guy). I have a short somewhere because when I crank the car with the battery cable attached, remove the battery cable while the engine is running, the car shuts off when I turn on the headlights. The park lights do not affect it. I haven't tried the radio or other accessories, but does anyone have any idea where to start looking for the short?