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Voltage drop reading.

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This picture shows a meter with a diode testing mode using a voltage to check for a defective diode.

Negative lead left side-arrow end, positive lead right-the bar or band end.

Reading O.L.= open lead / open circuit. The diode is a one way valve, the positive supply is now on the banded end and no current flows back to the ignition circuit.


© R.M.
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Alternator problems

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