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Old 05-03-2023, 12:26   #1
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Battery charger drawing current when off

I have a 40 amp Cristec charger with three outputs. It charges two main start batteries and the generator start battery.

I replaced the generator battery and decided to check if there was a parasitic draw. With the multimeter leads between the battery terminal and the charger cable, I saw 4ma of current being drawn from the generator battery with the chargerís AC breaker off.

I unplugged the AC power cord from the charger and saw no change. When I unplugged the connector that has the three battery charge leads, the draw went to zero.

Is this normal? Iím guessing the charger has blocking diodes or something similar to keep the three batteries from seeing each other. Maybe there is leakage through those?
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