Jan 09, 2023 - 01:57 AM
Make sure your alternator's positive and negative terminals are clean. Put the multimeter's black cable into the negative terminal and the red cable into the positive terminal. Charging output can be tested on a vehicle with a digital voltmeter. A good alternator should produce about 13.5 to 14.5 volts with the engine idling. If the voltage reading is low (12.5 volts or less), it indicates a charging problem.
Examine the alternator fuse. There is most likely a short circuit, and the alternator output should be connected to the ground. The alternator is grounded to the engine block by its mounting points so the engine block itself becomes an electrical ground distribution block. You just need to find a suitable bolt to secure your additional ground wire. You can add a wire from the chassis of the car to the engine block.
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