Posted by John B. on December 03, 2016 at 11:35:18 from (50.106.218.100):
In Reply to: Charging puzzle posted by notjustair on December 03, 2016 at 10:08:51:
Yes this sounds like a voltage regulator malfunction. The alternator is charging fine but the regulator is telling it how much & when to charge. Make sure the regulator is grounded good. One other thing is alternators should charge very well at an idle. One last thing is voltage shouldn't fluctuate as you had mentioned. Amperage will start off high and slowly lower once battery is charged. If you have a temp gun check all your connections while it's acting up. Any high readings will mean a loose or bad connection. Sometimes the two prong plug will have loose connection and cause this problem. It vibrates and gives the readings you're experiencing.
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