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Old 03-02-2018, 11:42 AM
Peter Grave Peter Grave is offline
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The reason its going off when you put the lights on is you are increasing the load or there is a short in the lighting system somewhere (doubtful). When the load goes up the alternator compensates by charging more thus it pulls harder on the belt and squeal results. Double check your belt tension and pulley size on the new alternator is it correct for the belt you are using if not this will cause what you are getting under a heavier load. BTW a 100 amp alternator ain't exactly heavy duty.
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