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Old 09-04-2019, 07:48 PM
omgitsjoe omgitsjoe is offline
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Default Overvoltage problem

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Im trying to use my new power inverter and it works fine with the engine to my van off. But when the engine is running it shuts down because of over voltage. I checked the voltage while it is running and its 15v. How can i step this down to 12-14v?
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Old 09-04-2019, 09:04 PM
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Aerindel Aerindel is offline
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What is the normal spec for your van? Most alternators run 13.5-14volts. A failing alternator however will run high.
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Old 09-04-2019, 09:35 PM
chuckklr98 chuckklr98 is offline
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turn on some lights to load it up. but yeah the built in regulator is bad, and sounds like its over charging.
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Old 09-04-2019, 09:44 PM
Wulfthang Wulfthang is offline
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Assuming you've hooked it all up correctly and depending on what year and brand, etc. of your vehicle: If it's an early model, it probably has a separate voltage regulator. Replace it. They're cheap. Worst case scenario, you have a spare. If it's a later model, pull the alternator and have it checked on a test machine. Your vehicle should not be running at that high of a voltage.

If that doesn't fix it...meaning those parts are ok and it still has high voltage...check the ground on your alternator, the ground on your engine, the ground on your frame to body and the hot side of the battery circuit. It's easier than it sounds but you need really long leads for your multi-meter. Yeah, a bad connection in the circuit can screw it all up. It can cause a voltage drop which can cause assorted sensors, including the one in the voltage regulator, to get confused.
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