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Old 08-01-2015, 05:10 PM   #1
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Bee Cave , Texas
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9 Volts out of Univolt? Failing?

Trying to hook up a new car stereo. It wouldn't power up. Diagnosed it down to the voltage available up in the console. It's only 9 Volts. Is this a sign of a failing univolt? It have the AS plugged in, the Univolt is humming, the fuses are all fine. If I hook the stereo directly up to a 12 volt source, it works fine.

I just don't know enough about univolts to know if the 9 volt problem is due to the univolt or something else.

Thanks
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Old 08-01-2015, 05:30 PM   #2
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Measure the voltage at the univolt. If it is 12V then the problem is somewhere else. If it is 9 volts, then the univolt may be bad. Disconnect everything from it and measure the voltage again. If 9 volts, the univolt is bad. If it is 12 volts, measure the voltage on the wires you disconnected. If 12V the univolt is bad. IF 9 volts, you have a battery or wiring problem.

Al
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Old 08-01-2015, 06:50 PM   #3
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Do you have a battery in the loop? If not the Uni may be toast, it likes/requires a bit of resistance.

IIWY....I'd retire it regardless, and get a modern multi, (3 or 4) stage converter.

Give Randy a call for the straight scoop

Bob
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