Question about 1991 Buick Park Avenue

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System not charging.....brought alternator in, tested out to be fine, bought a new battery and still the system is not charging running out of answers...please advise thank you

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Take a 12v test light and punch into the wire(red &black wire) leaving the alternator. Do it with the engine off first to establish which wire is going to the battery since they are a little hard to see the colors. Now repeat the same test with the engine running. The light should get brighter. If it doesn't disconnect the connecter and touch the light on the terminal coming out of the alternator on the same side of the wire that you tested. Doe the light get brighter, if it does try replacing the connector and also if everything test good there, go to battery where the red and black wire comes from the alternator and disconnect it from the battery and check for continuity between this wire to the alternator. If there isn't any repair the break or replace the wire.

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