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OldRide Answers Home Using OldRide Answers Ask a Question   Browse Questions In: AMC Buick Cadillac Chevrolet Chrysler Dodge Ford Lincoln Mercury Oldsmobile Packard Plymouth Pontiac Studebaker Volkswagen Other Makes Classic Trucks  General Topics General Questions Help Identify Classic Car News General Restoration Vehicle Maintenance Site Suggestions & Comments          Search Questions:    7dgoat      Why is my volt meter jumping? 1970 pontiac gto 400 engine The volt meter needle is jumping. All the lights on the car " headlights-taillights-dashlights " are brightening and dimming with the jumps. I'm asking this question before i start buying parts " alternator-voltage regulater ". This problem started about a week ago. The needle jumps with the lighs on or not. It also jumps at all rpm's In drive or park. Has anyone seen this before? posted: October 17, 2010       Answers (3)   retiredpartsman      somewhere in the wireing you have a bad connection have seen this problem with carroded connections . look at the grounds first ,also check for bubbles on wire casing sign of heat do to bad wtre inside. posted:  October 17, 2010   60apache4by      yes i have, most likey its a diod in the diod treo in your alternator, have it checked by your parts store, as they usually do it for free. posted:  October 29, 2010   7dgoat      Thank you! I replaced the alternater and the voltage regulater and found corroded conections on the voltage regulater. The parts store also said the alternater was bad. I replaced everything and cleaned the conections and everything is fine now. posted:  April 14, 2011

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