Question about 1991 GMC Suburban
The voltage regulator is internal inside the alternator. A couple of things to check would be first if you installed a new alternator check the back of the alternator fof a pin (will look like a bent piece of stiff wire) you must remove this for the alternator to work. It is installed so if you have to clock the alternator to install it on some cars. Also check that the alternator is grounded and that it is getting current if all is fine the new alternator is defective.
Posted on Jul 12, 2010
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Posted on Jan 02, 2017
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