GM Alternators
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GM alternators are common replacement parts needed by owners and repair technicians. These vital components are in charge of providing the initial power to the car batteries upon startup. If they fail, driving may not be possible, and the parts must be immediately replaced. Sometimes, though, they can fail in stages, and checking the output of power is a great way to ease suspicion surrounding faulty GM alternators.
The Function of a GM Alternator
The basic function of a GM alternator is to convert power from the gas engine into electrical energy to power the battery of the vehicle. When this component goes out, your battery can still keep operating for many miles, but the car may not start up again after disengagement. A good way to check the alternator's condition is to use a voltmeter to read the output of power.
Start the process by turning off all non-essential accessories (the radio, air conditioning, turn signals, etc.). The voltmeter must be connected to both the positive and negative terminals of the battery while the car engine is on but idle. On a DC scale, a typical GM alternator should read out at around 14 volts. Anything less than 12 volts could indicate a failure. Lastly, turn on a number of accessories at once and verify that the readout is still around 14 volts to ensure that everything is in proper working order.
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