User Manual

5 Testing & Troubleshooting
19
STEP #
Using a multimeter, check for MOTOR VOLTAGE between a chassis ground and the
RED wire at the relay block (i.e., the wire leading directly from the fuse).
Was MOTOR VOLTAGE detected?
5
YES
Proceed to STEP 6.
NO
Wiring fault between the fuse and the relay. Replace wiring and/or fuse socket.
Using a multimeter, check for approximately 12V between the negative (-) terminal of
the battery [#2] and the RED-YEL wire connected to terminal #2 of the compressor
isolating switch. (i.e., the wire leading from the vehicle’s ACC power.)
Was 12V detected?
6
YES
Proceed to STEP 7.
NO
Wire has not been connected correctly or accessory power has not been turned on.
Attach RED-YEL wire to live ACC power.
Using a multimeter, check for approximately 12V between the negative (-) terminal of
the battery [#2] and the RED wire connected to terminal #3 of the compressor isolating
switch. Test while spade terminals are still connected.
Was approximately 12V detected?
7
YES
Proceed to STEP 8.
NO
Switch fault or switch not turned ‘ON’. Replace switch or toggle switch to ‘ON’ position.
Using a multimeter, check for approximately 12V between the negative (-) terminal of
the battery [#2] and the RED wire connected to the pressure switch attached to the
compressor tank.
Was approximately 12V detected?
8
YES
Proceed to STEP 9.
NO
Wiring fault between the isolating switch and the pressure switch. Replace wiring.
Using a multimeter, check for approximately 12V between the negative (-) terminal of
the battery [#2] and the DK-BLU wire connected to the pressure switch attached to the
compressor tank. Test while spade terminals are still connected.
Was approximately 12V detected?
9
YES
Proceed to STEP 10.
NO
Pressure switch fault or tank not de-pressurized.
Replace pressure switch or drain tank.
Using a multimeter, check for approximately 12V between the negative (-) terminal of
the battery [#2] and the DK-BLU wire at the relay block. (i.e., the wire leading directly
from the pressure switch)
Was approximately 12V detected?
10
YES
Proceed to STEP 11.
NO
Wiring fault between pressure switch and relay block. Replace wiring.
Disconnect the relay from the relay block. Using a multimeter, check the continuity
between the BLK wire at the relay block and the negative (-) terminal of the
battery [#2].
Did the resistance measure less than 1 Ohm?
11
YES
Reconnect the relay to the relay block. Proceed to STEP 12.
NO
Wiring fault in the ground wire between the battery and the relay block.
Replace wiring.
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