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check the voltage coming back to your battery. Kind of sounds like your regulator is shorting and not sensing correct battery voltage. Otherwise check to see if the new gauge has an adjustment on it to increase resistance and drop the voltage dropped across it.
 

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Voltage should be 14.5-15 volts max (maybe higher
when its cold out - below 30 degrees F). First
thing is to confirm the reading with a multi-meter.
If the reading is confirmed you may be able to adjust the voltage if its an old voltage regulator
since they had an adjustment screw. Anyway I'd
check all connections and grounds. It could very well be a bad voltage regulator, as the last one I replaced also put out a high voltage. NAPA offers
a quality voltage regulator which I found to be more stable than AC Delco.
 
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