[rockwood84]

130,000 miles is about the life of the factory alternator brushes. don't know if you can still get brushes for a '91 g.m. alternator or not. i know that '98 up they don't sell brushes you have to buy rebuilt or new. if you can get a set of brushes and new voltage regulator for the alternator just redo it . as for autozone testing equipment they told me my ford starter was working and the bendix wasn't even kicking in to start the car. the starter would turn over but wasn't kicking to hit flywheel.