The function of the voltage regulator is to limit the output voltage by controlling the flow of current in the alternator rotor field coil which, in effect, controls the strength of the rotor magnetic field.
All models have a solid-state (silicon transistor) voltage regulator which is not adjustable. The regulator is in the engine compartment and clearly labeled.
REMOVAL & INSTALLATION
- Release the spring clips and pull off the regulator wiring plug.
- Unbolt and remove the regulator.
- Installation is the reverse of removal. Be sure that the spring clips engage the wiring plug.
VOLTAGE REGULATOR TEST
- Clean the battery terminals and check the specific gravity of the battery electrolyte. If the specific gravity is below 1.200, charge the battery before performing the voltage regulator test as it must be above 1.200 to allow a prompt, regulated voltage check.
- Connect the positive lead of the test voltmeter to the positive lead to the positive battery terminal.
- Connect the voltmeter negative lead to a good body ground.
- Start and operate the engine at 1,250 rpm with all lights and accessories switched off. Observe the voltmeter reading. The regulator is working properly if the voltage readings are as follows:
- If the voltage reading is below the specified limits or fluctuates, check for a bad voltage regulator or ground. If the reading is still low, switch off the ignition and disconnect the voltage regulator connector. Switch on the ignition but do not start the car. Check for battery voltage at the wiring harness terminal. Both leads should have battery voltage. Switch off the ignition. Replace the regulator if the terminals show battery voltage. The trouble could also be the field-loads relay.
- If the voltage reading is above the specified limits, check the ground between the voltage regulator and the vehicle body, and between the vehicle body and the engine. Check the ignition switch circuit between the switch battery terminal and the voltage regulator. If the voltage reading is still high (more than 1 / 2 V above the specified limits), replace the voltage regulator.