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Home >> Mercedes Benz >> 2001 >> ML430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Generators & Regulators) >> On-Vehicle Testing >> Generator Output
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Generator Output

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  1. Ensure connections at battery and generator are clean and tight. Ensure generator, engine and body are properly grounded. Ensure generator drive belt is properly adjusted and in good condition.
  2. Connect load tester/ammeter as per tester manufacturer's instructions. Connect voltmeter leads to battery terminals. Start engine and run at 3000 RPM. Adjust load tester to obtain maximum generator output. DO NOT allow voltage to drop to less than 12.7 volts.
  3. Maximum generator output should be within a few amps of generator rated output stamped on generator. If output is not within a few amps of generator rated output, replace voltage regulator and retest. If output is still low, repair or replace generator.
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