How To Test Your New Alternator

1957 Chevrolet Truck

Testing your new alternator is as simple as turning your ignition key on. Take a look at your voltmeter. It should be reading 12 to 12.5 volts. If not then your battery may be run down a little or a lot depending on your voltage reading. Lets assume battery voltage is at exactly 12 volts on your new panel meter. Start your engine. As you are turning it over, watch you volt meter. It’s normal for your voltage to drop as the starter is engaged. Lets also assume that your engine started and your battery is fully charged. Your voltmeter should now indicate 13.5 to 14.5 volts.

Turn on your lights. Voltage may drop slightly. Turn on your stereo and or AC. Each new load may lower your voltage slightly especially at idle speed. However your system voltage should always remain well above the battery voltage with the engine off. A system voltage, with engine on, equal to or less than battery voltage is an indication of poor alternator performance. Your alternator must provide more current than your car and it’s equipment demands.


1957 Chevrolet Station Wagon - Alternator
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1955 Chevrolet

1955 Chevrolet For Sale

1955 Chevy Belair, 1955 Chevy 210, 1955 Chevy Street Rods, 1955 Chevrolet Trucks and 1955 Chevrolet Parts.



1955 Chevrolet

1956 Chevrolet For Sale

1956 Chevy Belair, 1956 Chevy 210, 1956 Chevy Street Rods, 1956 Chevrolet Trucks and 1956 Chevrolet Parts.



1957 Chevrolet

1957 Chevrolet For Sale

1957 Chevy Belair, 1957 Chevy 210, 1957 Chevy Street Rods, 1957 Chevrolet Trucks and 1957 Chevrolet Parts.