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Alternators & Regulators - Electronic Regulator: Testing

  1. Connect positive lead of voltmeter to ignition No. 1 terminal of ballast resistor (end with one or two blue wires connected to it). Connect negative lead of voltmeter to a good body ground. Start and operate engine at 1250 RPM with all lights and accessories turned off. Check voltmeter, regulator is working properly if readings are within specifications.
  2. If voltage is below specifications, check for good voltage regulator ground. Check for voltage drop between cover of regulator and body. Turn ignition off, disconnect voltage regulator connector. Turn ignition on, but do not start car, and check for battery voltage at wiring harness terminal connected to blue and green leads.
    NOTE: Disconnect wiring harness from voltage regulator when checking leads.

    If readings are within specifications, replace voltage regulator and repeat step 1)  .

  3. If voltage was higher than specifications, check ground between regulator and vehicle body. Check ground between vehicle body and engine. Check ignition switch circuit between battery terminal of switch and voltage regulator. If voltage is more than 1/2 volt above specifications, replace regulator and repeat step 1)  .
    Specifications

    Ambient Temperature Voltage Range
    -20°F 14.3-15.3
    80°F 13.8-14.4
    140°F 13.3-14.0
    Above 140°F Less than 13.8
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