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Home >> Mercedes Benz >> 1979 >> 300SD >> Repair and Diagnosis >> Maintenance >> Procedures >> Alternators & Regulators - Testing >> Testing >> On Car Testing
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On Car Testing

Perform tests at normal operating temperatures. Engine should be accelerated gradually to desired testing RPM and returned to lower RPM as soon as possible. Do NOT race engine.

CAUTION: Never disconnect battery or alternator leads while alternator is running. Reverse polarity or excessive voltage will severely damage the charging system.