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Generator/Regulator Output Test: 3.0CL

  1. Test system using a generator tester with carbon pile. Hook up tester according to manufacturer's instructions. Start engine and operate at 3000 RPM until radiator fan comes on, after fan comes on, let engine idle. Increase engine speed to 2000 RPM and hold. Observe voltmeter. If voltage is more than 15.1 volts, replace voltage regulator. If voltage is 15.1 volts or less, go to next step.
  2. Return engine to idle. Ensure all accessories are off. Zero the ammeter. Connect inductive pick-up over generator terminal "B" (battery terminal wire). See Figure. Ensure arrow on inductive pick-up points away from generator. Increase engine speed to 2000 RPM and hold. Observe voltmeter. If voltage is 12.5 volts or more, go to next step. If voltage is less than 12.5 volts, replace generator and repeat voltage test.
  3. While observing ammeter, apply load with generator tester carbon pile until battery voltage drops to 12-13.5 volts. If less than 75 amps has been applied, replace generator. If 75 amps or more has been applied, charging system is functioning properly.
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