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Old 07-13-2007, 03:46 PM
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Voltage rises to 16V when air conditioner is on

Friend just called. He has owned a 32 Ford w/350 for 2 years with no problems. He turned his air conditioning on for the first time. He said it was blowing cold air like it should but a little ways down the highway he noticed his volt gauge climbed from 14V to 16V. He shut the air off and the gauge went back to 14V. Car has been fine since but he is worried that he may have damaged his battery at all. Anyone heard of this?

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Old 07-13-2007, 04:50 PM
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Quote:
Originally Posted by heyjude076
Friend just called. He has owned a 32 Ford w/350 for 2 years with no problems. He turned his air conditioning on for the first time. He said it was blowing cold air like it should but a little ways down the highway he noticed his volt gauge climbed from 14V to 16V. He shut the air off and the gauge went back to 14V. Car has been fine since but he is worried that he may have damaged his battery at all. Anyone heard of this?
One hell of an alternator is all I can say. Don't see any need to worry as long as this only happens with the high amp load of the air conditioning.

Bogie
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Old 07-13-2007, 06:04 PM
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I suspect that the voltage regulator is faulty as load increases amps should go up voltage should go down.
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Old 07-13-2007, 07:34 PM
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Bad regulator in the alternator would be my guess. Could damage the battery, lights or other electronic equipment.
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Old 07-13-2007, 07:50 PM
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Doc here,

First of all, is the gauge accurate??

With a DVOM, measure across the battery at a "No load" warm idle..not the readings.

Next, turn the A/C on..note the readings..

Compare the readings against the panel gauge readings..IF they agree, AND it has a Three wire alternator, move the small red wire (remote sense) to a different source of power, like the horn relay power wire, or any 12 volt source at the END of the vehicle buss system..

This will provide better regulation (regulator on sooner, off later) than what you have now..

If it is a one wire, or the above does not change the readings, get a kit, about $15, and depending on how new the alternator is..either install the internal regulator, and save the rest of the kit parts OR rebuild the whole alternator..

IF it is externally regulated, the air gap and field relay may need adjusting to bring the voltage down.

16 Volts is a bit high, but won't cook the battery unless it is running that way full time..but the normal should be 14.4 volts on a warm, idle, no load engine.

Doc
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