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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
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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
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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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