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How do you know if your alternator is going out on your 2003 gmc 1500?
Wiki User
∙ 15y ago
If you have a battery load tester, it is also an alternator tester. Put it on your batt., a good battery should read 12 volts--start the engine and watch the needle, it should go up to the 13 volt range. Turn on all the lights, heater fan on high, then check the guage, it should still be in the 13 v. range. If at any time it goes below 12 volts, then the alt. is weak.
Wiki User
∙ 15y ago
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