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Battery drains overnight — parasitic draw test

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4 Total steps

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Step 1 of 4

Diagnostic

Quality the battery and the charging system first

Step 1 of 4

Load-test the battery and check the charging voltage at idle and with electrical loads switched on. Only continue if both are sound.

A battery that passes a load test, and charging within the general band for the system.

What did you find?

Pick the outcome you actually observed. The flow follows the branch the author wrote for it.

The battery fails the load test Fault
Replace the battery and retest the complaint. There may be no drain at all.

End of this branch
The charging system is at fault Fault
Diagnose the charging circuit first.

End of this branch
Battery and charging are sound Normal
Continue with the drain measurement.

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Measurement

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