Voltage

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Aug 3, 2019 | 07:21 AM

green_95

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Tuned

Joined: Aug 2015

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Voltage

Just wondering what kind of voltage every one is running while driving. I have a scan gauge II and mine runs anywhere from 13.5 to 13.9 while driving. Never hits 14. Is this normal or do I have a weak alternator?

Aug 3, 2019 | 07:55 AM

TooManyToys.

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Joined: Dec 2014

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From: Jersey Shore

The PCM reporting of voltage out of the OBD2 can show a reading down to 0.5v from what it actually is at the battery or alternator. The best way to settle your concern is to use a voltmeter to check at the batteries, then compare that to what you are reading at the SG2 at the same time. The situation drove me nuts for a while.

Aug 3, 2019 | 02:28 PM

Euroman

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Joined: Nov 2014

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From: France

And don't use one that plugs into the lighter socket - that can vary by a huge amount, depending on quality, other loads on the circuit, and temperature.