Rick's Free Auto Repair Advice

Posts Tagged: safe way to test an alternator

The safe way to test an alternator

How to test an alternator Disconnecting a battery cable while a car is running to test an alternator can damage your car’s computers and computerized controls. You could do that on non-computerized cars, but not on any car since the early ’80’s. What happens if you disconnect battery terminals while engine is running? When you start your car, the voltage regulator takes a look at battery voltage. If it’s at 12.7 volts, the regulator determines that the battery is in good shape and doesn’t need charging. But once you turn … Read More


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