Compressor Current Draw, Pressure Output & Leak Down Test

1. Disconnect the wiring harness from the compressor motor.
2. Disconnect the air line between the dryer and the right rear shock absorber.

Pressure Testing:

3. Connect a suitable air pressure gauge in the system.
4. Disconnect the wiring harness from the compressor.

Compressor Current Draw Test:

5. Connect a jumper wire between the red wire in the compressor motor connector and a 12 volt power source.
6. Connect a suitable ammeter between the black wire and ground.
7. Check the amount of current draw through the compressor motor.
- If the current draw is more than 21 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 220 PSI (maximum output), the solenoid exhaust valve will relieve the excess pressure. This should not be considered an abnormal leak.