Using a multimeter to measure the forward resistance of the diode can preliminarily determine whether the diode is good. The specific operation is as follows: (1) Connect the black lead of the multimeter to the positive pole of the battery and the red lead to the drain of the diode (i.e...
Battery Testing battery drain test - looking for a parasitic drain. A parasitic drain is when an electrical device is using battery power when the car is closed, and the ignition key removed. Therefore, when doing this test make sure that the dome light, under hood light, trunk light, etc...
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