BELT TENSION
Inspect condition and tension of generator drive belt prior to performing any on-vehicle charging system tests. Replace belt and/or repair tensioner mechanism if necessary. Belt tension is okay if belt length indicator is within limit marks on tensioner. Replace belt and/or tensioner mechanism if necessary.
OVERCHARGE CONDITION
- If voltmeter indicates high voltage (more than 15.4 volts), turn ignition switch to ON position. Connect negative voltmeter lead to ground. Connect positive voltmeter lead to generator output connection at starter solenoid. Record voltage.
- Connect positive voltmeter lead to regulator "A" terminal screw on rear of generator. (Схема №1)and (Схема №3). If voltage difference between both locations exceeds 0.25 volt, repair high resistance condition in "A" terminal circuit wiring.
- If excessive voltage still exists, check ground connections for both generator and regulator. Tighten regulator ground screws to 16-24 INCH lbs. (1.8-2.7 N.m.), and recheck output voltage.
- If excessive voltage still exists, connect voltmeter negative lead to ground. Connect positive voltmeter lead first to regulator "A" terminal screw, then to "F" terminal screw. Record readings. Different voltages at each screw head indicates a short in field circuit or a grounded rotor coil. To correct either condition, replace generator.
- If same voltage appears at both screw heads, no internal short to ground is indicated. Replace voltage regulator.
LOW OR NO CHARGE CONDITION
- Unplug harness connector from regulator at rear of generator. Connect ohmmeter between regulator "A" and "F" terminal screws. (Схема №1)and (Схема №3). If resistance is not greater than 2.4 ohms, a short in field circuit or a grounded rotor coil is indicated. Replace generator. If resistance is greater than 2.4 ohms, go to next step.
- Reconnect regulator wiring plug. Connect negative voltmeter lead to ground. Contact positive voltmeter lead to regulator "A" terminal screw. If voltmeter does not indicate battery voltage, repair open or high resistance in "A" circuit wiring. Perform load test after repairs.
- If battery voltage is indicated at "A" terminal screw, ensure ignition switch is in OFF position. Connect positive voltmeter lead to regulator "F" terminal screw. If battery voltage is present, go to step 4). If battery voltage is not present, replace generator.
- Turn ignition switch to ON position (engine off). With voltmeter negative lead to ground, contact positive lead of voltmeter to regulator "F" terminal screw. If voltmeter indicates 2 volts or less, go to next step. If voltage is greater than 2 volts, check circuit between "I" terminal and ignition switch. Repair if necessary. See «"S" & "I" CIRCUIT TEST»(ref-58781-S22427624322001011700000). If "I" circuit is okay, replace regulator. Perform LOAD TEST after repair.
- Start engine and run at 2000 RPM with headlights on. Measure voltage at "B+" terminal of generator and at generator feed wire at starter relay. If voltage readings differ by more than 0.5 volt, repair high resistance or open in wire between "B+" terminal and junction near starter relay.
- If generator still does not charge sufficiently, connect a jumper wire to regulator "F" terminal screw and ground it to rear housing. If output voltage increases to 13-15 volts, replace regulator. If output voltage does not increase to at least 13 volts, replace generator.