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Alternator To Battery Continuity Test

NOTE: Check alternator wire harness connections, drive belt tension and ensure battery is fully charged prior to performing test.
  1. Turn ignition switch to OFF position. Disconnect negative battery cable. Remove output lead from alternator terminal "B". See Fig 1. Install a 100-amp ammeter in series to terminal "B" and disconnected output lead. Install positive lead of ammeter to terminal "B" and negative lead to disconnected output wire.
    Fig 1: Identifying Alternator Terminals
    G90C08766Courtesy of CHRYSLER MOTORS.
  2. Install a digital voltmeter between alternator terminal "B" and positive battery terminal. Install positive lead wire of voltmeter to terminal "B" and negative lead wire to positive battery terminal. Reconnect negative battery cable.
  3. Start engine. Turn accessories on and adjust engine speed until ammeter indicates 20 amps and note voltmeter reading. If voltmeter indicates .2 volt, system is okay.
  4. If voltage is greater than .2 volt, wiring is defective between alternator terminal "B", fusible link and battery positive terminal. Disconnect negative battery cable and remove test equipment.
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