Alternator To Battery Continuity Test
NOTE:
Check alternator wiring harness connections and drive belt tension and ensure battery is fully charged before performing test.
- 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 with terminal "B" and disconnected output lead. Install positive lead of ammeter to terminal "B" and negative lead to disconnected output wire.
- Install a digital voltmeter between alternator terminal "B" and positive battery terminal. Install positive voltmeter lead to terminal "B" and negative lead to positive battery terminal. Reconnect negative battery cable.
- Start engine. Turn accessories on and adjust engine speed until ammeter indicates 20 amps, and note voltmeter reading. If voltmeter indicates .2 volt or less, system is okay.
- If voltage is greater than .2 volt, wiring is defective between alternator terminal "B", fusible link and positive battery terminal. Disconnect negative battery cable, and remove test equipment.