Hook up a voltmeter and start the truck, readings at the battery should be 13.8-14.8 volts, any lower than that and there is a charging problem, can be a battery or cables, alternator/regulator, fusible link can be blown, especailly if the jumpers were hooked up wrong.
ON-VEHICLE Preliminary Inspection Check alternator wire harness connections and drive belt tension. Check "ENGINE", "CHARGE", "IGN" and alternator fusible link for continuity. Battery must be fully charged prior to beginning test. No Load Test
1. Connect battery/alternator tester according to manufacturer's instructions. Check amperage and voltage with engine running at 2000 RPM. On all models, alternator output should be less than 10 amps.
2. Voltage should be 13.0-14.8 volts on Corolla and Tercel (without IC regulator). Voltage reading on all other models should be 13.5-15.1 volts.
3. If voltage reading is above specified range, replace IC regulator. If voltage reading is less than specified, ground "F" (full field) terminal. See Fig. 2.
4. If voltage now climbs above specified range, replace IC regulator. If reading remains below specified range, repair or replace alternator. Turn on high beam headlights and place heater control on "HI". Run engine at 2000 RPM and check amperage. Ammeter should read more than 30 amps. If reading is less, repair or replace alternator.
If reading is low due to a fully charged battery, it may be necessary to crank engine with coil disconnected for about 15 seconds to partially discharge battery.
Saturday, July 19th, 2008 AT 10:34 AM