1989 Toyota 4Runner ALTERNATOR AND REGULATOR – NIPPONDENSO

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ON-VEHICLE TESTING NO LOAD TEST 1) Disconnect alternator terminal “B” wire. Using an ammeter and voltmeter, connect negative ammeter lead to disconnected alternator terminal “B” wire and positive lead to alternator terminal “B”. Connect voltmeter positive lead to alternator terminal “B” and negative lead to ground. See Fig. 1. Fig. 1: Charging Circuit Testing Courtesy of Toyota Motor Sales, U.S.A., Inc. 2) Start engine and increase engine speed to 2000 RPM. Voltmeter and ammeter should read according to specification. See ALTERNATOR OUTPUT SPECIFICATIONS table. 3) If voltage is more than specified, replace IC regulator. If voltage is less than specified, ground “F” (full field) terminal. See Fig. 2, 3 or 4. 4) If voltage now climbs above specified range, replace IC regulator. If voltage remains below specified range, repair or replace alternator. ALTERNATOR OUTPUT SPECIFICATIONS @ 2000 RPM pplication Amps (1) Volts Cressida …………………. 10 ………………… 14.0-15.0 Land Cruiser ……………… 10 ………………… 13.8-14.4 All Others ……………….. 10 ………………… 13.9-15.1 (1) – With temperature at 77F (25C). Fig. 2: Alt Full Field Output Test (Camry, Celica, Corolla 4A-GE, Cressida, MR2, Supra) Courtesy of Toyota Motor Sales, U.S.A., Inc. Fig. 3: Alt Full Field Output Test (Corolla 4A-F 4A-FE, Land Cruiser, Pickup, 4Runner)