| [GMCnet] Excessive voltage at 1500 rpm [message #347395] |
Thu, 05 September 2019 15:05  |
Jeff Von Haden
Messages: 3
Registered: June 2019
Karma:
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Junior Member |
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In June took possession of a well maintained 1976 Palm Beach with the 80 amp alternator/455 Olds.
First two 100+ mile trips alternator worked as it should. On the third trip volts would jump to over 16 and dummy light lit when I went over 55 (2000 rpm. So my short term solution was to drive at 50. Unfortunately after another 100 miles, it would exceed 16 volts when I got engine to 1500 rpm. I attached my voltmeter and it showed a sudden jump from normal to 16.3 volts at 1500 rpm, then drop to about 16 volts at 3000 rpm. At 1400 rpm voltage would suddenly drop down to the normal 14-14.5.
I replaced internal regulator. Exact same failure. Then took alternator into Autozone and alternator tests fine.
Thoughts?
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