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voltage problem? or is it?

Old 08-27-2015, 10:53 PM
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Join Date: Jul 2015
Location: Texas
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Default voltage problem? or is it?

hey guys, got a dumb question. i just installed an electric fan and im wondering if its pulling my volts down too much. when i start up the car (1965 mustang completely new wiring) the after market volt gauge (not accurate) is showing 14 volts when i turn on the fan the meter drops to 12 volts if i turn on the ac it drops to about 10 volts. i have a brand new Powermaster 140 amp alternator one wire. the cars seems to be running ok just alittle worried if im pulling too much. oh and i have two small radio amps that pull about 25 amps. when the internal voltage regulator in the amp kicks on the radio "pops" any ideas please!
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Old 08-29-2015, 06:12 PM
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Join Date: Apr 2007
Location: California
Posts: 10,468

Need to know how things are wired, particularly the fan and voltage gauge.

A lot of the factory wiring was undersized even for back then, so you add a few things that pull from circuits that are too small and you get a voltage drop. You can wire a **** ton of relays to a circuit like that for the coil side, because they operate even with very little voltage, and the voltage may show low; but the actual power/switch side of the relay may be 14.5 or whatever.
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