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But a battery power drain can also be the work of a bad alternator diode or even a faulty battery. Depending on the amount of current being drained, a parasitic draw will suck all the juice from your battery in a few hours or minutes. Here, you have four tests to help you find the culprit: The amperage battery drain test. The voltage drop battery drain test. The bad alternator diode test.
4) check the battery Voltage. *** The Battery voltage Should read between about 13.8 to 14.2 volts. (Possibly up to 14.5 Volts.) 5) Increase motor speed to about 1500 RPM. The Alternator should now produce a battery voltage between 14.2 and 14.6 Volts.*** If it is Lower than 14.2 volts, the Alternator probably has one or more Bad Diodes.6) Now, Maintain the 1500 RPM and Turn off the Headlights.Possibly up to 14.5 Volts.) 5) Increase motor speed to about 1500 RPM. The Alternator should now produce a battery voltage between 14.2 and 14.6 Volts. *** If it is Lower than 14.2 volts, the Alternator probably has one or more Bad Diodes. 6) Now, Maintain the 1500 RPM and Turn off the Headlights.