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mpj76 · 11-08-2005, 11:55 AM

I once had a very old style (1970's) 130 amp alternator with an external voltage regulator. During my heater core swap job, I drove the car without the instrument cluster connected for about 2 days. Turns out that the alternator was excited by a charge on the same ciricuit as the cluster. Without this circuit closed, I had to blip the throttle to about 4-5000 RPMS to manually excite the alternator. I could also excite it by running a lead from the + battery terminal and touching one of the terminals on the regulator. If you're running an adequate gauge of wire and have good connections, you may have a similar problem.

11-08-2005, 11:55 AM	#6
mpj76 Registered Member Join Date: Sep 2002 Posts: 158	Re: voltage across battery when charging ? I once had a very old style (1970's) 130 amp alternator with an external voltage regulator. During my heater core swap job, I drove the car without the instrument cluster connected for about 2 days. Turns out that the alternator was excited by a charge on the same ciricuit as the cluster. Without this circuit closed, I had to blip the throttle to about 4-5000 RPMS to manually excite the alternator. I could also excite it by running a lead from the + battery terminal and touching one of the terminals on the regulator. If you're running an adequate gauge of wire and have good connections, you may have a similar problem. __________________ 91 Coupe: FMS 1 5/8 unqual shorty's, BBK off road X-pipe, Super Duty T5, Pro 5.0 short shifter, 2.73 rear, G3 alt, MSD coil, dist, no smog pump, oil cooler, 195K miles, 14 deg timing, 23 mpg city/29 mpg highway @ 65 mph.