Ranger 4WD V6-3.0L VIN U (1997)
Charge Lamp/Indicator: Testing and Inspection
The Integral Alternator Regulator (IAR) has a circuit in the voltage regulator that will indicate a high battery voltage condition. With the IAR system,
two conditions can cause the charge indicator lamp to come on during vehicle operation:
1. No generator output - damaged generator, voltage regulator or wiring.
2. Overvoltage correlation - shorted generator rotor, regulator or wiring.
If the system is working normally, the following conditions will be present:
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With ignition switch lock cylinder in OFF position, charge indicator (battery symbol) lamp is off.
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With ignition switch lock cylinder in RUN (engine not running), charge indicator (battery symbol) lamp is on.
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With ignition switch lock cylinder in RUN (engine running), charge indicator (battery symbol) lamp is off. Except as noted above.
If the charge indicator lamp does not come on with the ignition switch lock cylinder in the RUN position (engine not running), check the "I" circuit
(ignition switch lock cylinder to regulator "I" terminal) for an open circuit or burned out charge indicator lamp. Replace the lamp, if necessary.
3. If the charge indicator lamp does not come on, disconnect the wiring connector from the voltage regulator.
4. Connect a jumper wire from the wiring connector "I" terminal to the battery negative post cable clamp.
5. Turn the ignition switch lock cylinder to RUN (engine not running). If the indicator lamp does not light, check the indicator bulb for continuity and
replace the bulb if it is burned out. If the bulb is still good, perform the voltage regulator "I" circuit tests.
