Compressor Current Draw, Pressure Output & Leak Down Test

1. Disconnect the wiring harness from the compressor motor.
2. Disconnect the compressor air line at the "T" fitting.

Leak Down Test:

3. Connect a suitable air pressure gauge between the air line and the "T" fitting.
4. Disconnect the wiring harness from the compressor.

Compressor Current Draw Test:

5. Connect a suitable ammeter in series between the orange wire in the wiring harness and the dark green wire to the compressor motor.
6. Connect a jumper wire between the black wire on the compressor motor and ground.
7. Check the amount of current draw through the compressor motor.
- If the current draw is more than 14 amps, replace the compressor assembly.
8. When the air pressure stabilizes at 120 PSI, disconnect the ammeter and jumper wires and watch the air pressure gauge.
- If the air pressure quickly leaks down to 90 PSI or less, replace the compressor.
- If the output pressure is less than 110 PSI when it stabilizes, replace the compressor.

If the compressor is allowed to operate until it reaches 200 PSI (maximum output), the solenoid exhaust valve will relieve the excess pressure. This should not be considered an abnormal leak.