If the Alt gauge is pegged, the alternator is overcharging and could cause serious damage to the electrical system. This is most likely the result of a faulty voltage regulator. I need you to try something for me. All you will need is a multi meter (volt gauge).
Follow these directions and let me know what you find. NOTE: Do Not run the vehicle other than to do the test. If it is overcharging as you described, it could cause a fire.
https://www.2carpros.com/articles/how-to-check-a-car-alternator
Let me know what you find.
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Friday, June 27th, 2014 AT 8:39 PM