On-Vehicle Test
- Disconnect battery cables and install cutout switch, variable resistance, ammeter and voltmeter. See Fig 1. Connect ground cable and check that cutout switch is in closed position.
- Start engine and run at 3000-4000 RPM (do not exceed manufacturer's RPM limits). Adjust variable resistance to give the following amperage readings: Models with 65 amp alternators - 45 amps, with 55 amp alternators - 25 amps.
- Open battery cutout switch to separate battery from test circuit. Load current is now determined by variable resistance. Readjust variable resistance to provide Test Output Amperage. Voltage should be as specified.CAUTION: Never run alternator without battery connected unless variable resistor is installed to provide load. Alternator or regulator or both could be severely damaged without providing current load.