1124
« on: August 10, 2009, 11:43:04 PM »
My car will put out 12.7 volts at idle, which is fine for a 37 amp alt. And it will hit 14.2 before I get to 2 grand. Your car is still not reaching optimum output. You say it's an old harness so inspect and CLEAN all the connections and insure all EXCELLENT grounds. Before you start checking proper readings at the brown and blue wire at the VR I would have the alternator tested and put in a Wells VR715. The readings of those wires will determine why the GEN light stays on and how the system is sensing inadequate voltage.
There is a way to recalibrate a Delco VR but quite frankly I could not be bothered with a correct looking VR on my Jane and went to a 715.
Apparently your j. block was bypassed but that's not an issue now aside from cosmetics. But it would annoy me. Test the alternator? Well you know it's charging but the VR may be limiting it or it's toast. Perhaps a diode. I have them rebuilt and don't trust remans after the butchery I saw in one. Old brushes and dried out bearings in a shiny case.