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Have you checked the output from the voltage regulator? I will bet you a beer that either the voltage reg. has went south or the entire alternator is shot. I just had my alternator replaced ($380 installed, rebuilt). My tach was occasionally going bonkers, and the 'protection' circuit on my stereo amp kept kicking in. It could have been just the regulator, but I opted to do the whole alternator. Cleared it right up.
The car actually runs and idles better since the change.
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2022 Royal Enfield Interceptor
2012 Harley Davidson Road King
2014 Cayman S, PDK
Mercedes E350 family truckster
Steam locomotive. Yes, you read that right.
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