TwinTurbo.NET: Nissan 300ZX forum - A surge/overcharge is anything above 14
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Subject A surge/overcharge is anything above 14
     
Posted by FrozTTy on May 22, 2018 at 11:58 AM
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In Reply To Bad alternator, relay, or something else? posted by OverZealous (CT) on May 21, 2018 at 07:58 PM
     
Message So 18 is baaaaaad.
Yes, I believe it's called the voltage regulator that keeps the charge where it should be.
I'm ASSuming you've checked the ground and alternator harness?
Your battery cell(s) are also probably fried/bad due to the overcharging.
PepBoys, Autozone, etc will simply put a volt-meter on your battery while car is running and all accessory light are on. If it is OVER 14.5 they will say your alternator and/or regulator are fried.

     
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