How To Test an Alternator
Test the Resting Battery Voltage
- If you don’t already own one, get a cheap multimeter.
- Set it to read volts.
- With the engine off, touch the red probe to the battery’s positive terminal and the black probe to the negative terminal.
- The voltage should read between 12.3 and 12.8 volts. If it’s below that, charge the battery with a battery charger before you conduct the test again.
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