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Undercharged Or Overcharged Battery Test

  1. Disconnect 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 less than 10 volts, check for an open in wire 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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