Posted by Steve@Advance on December 03, 2016 at 11:15:37 from (107.203.134.67):
In Reply to: Charging puzzle posted by notjustair on December 03, 2016 at 10:08:51:
It probably is a regulator or internal resistor problem.
Do you know if it did it with the original alternator? And is this alternator the same or more amp output as the original? If you are running a lot of accessories, it could be more than the alternator can do at low RPM.
Another thing you might try, the wire on the back of the alternator from the #2 terminal of the plug, typically is jumped to the BAT terminal on the alternator. That is the voltage reference signal. If there is higher than normal resistance on the wire from the alternator to the battery, it could give it a false signal. You could try (just temporary to see if it will work) remove the #2 wire from the BAT terminal and connect it directly to the positive battery cable at the starter. See if that changes the pulsing, could give it a more stable reading without the resistance voltage difference.
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