Installed in a 2001 Jimmy 4.3 this may be the easiest car to replace an alternator. "Dental Drill" whistle, flickering lights, etc. The new device will charge normally. Please note that AC Delco Professional is made for AC Delco and is their aftermarket line. I've been using their products on GM vehicles for years with no problems. Better quality and reliability than wholesale refurbished for the same price.
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