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Undercharged Or Overcharged Battery Test

  1. If battery is undercharged or overcharged, disconnect alternator wiring harness connector from alternator. Using a voltmeter, connect positive voltmeter lead to alternator wiring harness terminal "L" and negative lead to ground.
  2. Turn ignition switch to the RUN position (engine not running). If voltmeter reads zero volts, check for an open between terminal "L" and battery. Repair as required. Reconnect alternator wiring harness connector.
  3. Using a voltmeter, connect positive voltmeter lead to positive battery post and negative lead to negative battery post. Start engine and run at moderate speed. If voltage reads more than 16 volts, replace alternator.
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