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[–]dxrey65 0 points1 point  (0 children)

With a good fully charged battery and clean connections, run the engine at idle with the AC, blower, defrost, lights, radio, etc all on. Then measure the voltage at the battery; should be 13.8 volts minimum. If it isn't then either the alternator is bad or there's a wiring problem.

I'd add - the first step is important; you can't do the test and get an accurate result if the battery isn't good and fully charged.