Full Field Test
CAUTION:
When performing full field test on alternator, charging voltage will increase quickly. DO NOT allow voltage to increase above 18 volts; electrical system will be damaged.
Remove protector from full field access hole, located at rear of alternator end cover. See Fig 1. Insert screwdriver into hole of alternator, by-passing voltage regulator. Increase engine speed to 2000 RPM and monitor voltage and amperage increase. Voltage should be more than 15.1 volts. Amperage should be more than 40 amps. If amperage or voltage is less than specification, replace or repair alternator.