> Car voltage low from idling to 2K+ RPM: 12.1-12.5V, but goes up to 13.5-13.9V on coasting?

Car voltage low from idling to 2K+ RPM: 12.1-12.5V, but goes up to 13.5-13.9V on coasting?

Posted at: 2015-01-07 
14.8 volts will eventually boil the acid out of the battery!! IF an alternator is making 13.5 - 14.2 volts at the battery terminals AFTER a 10 mile drive the voltage is perfect at idle.

If you don't have an auto-electric shop in your area to try to install the internal voltage regulator, you need to replace the alternator from NAPA or Carquest.

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Voltage regulator has gone T/U. Probably internally regulated (car make and model would have helped) If so, replace alt,. should put out around 14.8V during idle OR high RPM.

Check your accessory drive belt it could be slipping under load.

idk

Just changed car battery and alternator seems to develop this odd behaviour:

- Foot on gas: 12.1-12.5V till 2K+ RPM, momentarily hits ~14V if rev till 3K+ RPM

- Foot off gas: 13.5-13.9V till back to idling at 12.1-12.5V

Any ideas as to what/where exactly is the problem? Thank you very much in advance!