I bought a lemon Big Problem

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Just because your meter is showing low voltage or dropping off suddenly, it doesn't mean you have a charging problem. It could be the gauge or where it's getting information from. The triple meter gets info from combination meter. Check those connectors and wiring under the dash. The voltmeter also requires power form ignition switch.

Before you pull out the alternator, (napa can do this or with a simple multimeter) make sure you are actually charging, or not, by checking on alternator output directly.

Checking charging directly on battery might give you false readings as the ECM controls when to charge the battery.

If it fluctuates between 14.4-14.6 volts and then drops to battery voltage, say 12.6-12.8, then its working.

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