ARB CKMTA12 - Post-Installation Check List

5 Testing & Troubleshooting
20
ST E P #
5
[24V COMPRESSOR AND WIRING ONLY] Using a multimeter, check for 12V
between a chassis ground and each of the two contacts in the mini-blade fuse holder.
Was 12V detected at one of the two contacts?
YES
Reconnect the fuse into the holder. Proceed to STEP 6.
NO
Wiring fault between the negative (-) terminal of the battery [#2] and the fuse holder,
Check the wire connection at the battery terminal and/or replace the wiring and /or fuse
holder.
6
Remove the compressor cover as shown in Section 2.2. Using a multimeter, check for
MOTOR VOLTAGE between a chassis ground and the RED wire at each of the relay
blocks (i.e., the wire leading directly from the fuse).
Was MOTOR VOLTAGE detected?
YES
Proceed to STEP 7.
NO
Wiring fault between the fuse and the relay. Replace wiring and/or fuse holder.
7
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?
YES
Proceed to STEP 8.
NO
Wire has not been connected correctly or accessory power has not been turned on.
Attach RED-YEL wire to live ACC power.
8
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 12V detected?
YES
Proceed to STEP 9.
NO
Switch fault or switch not turned ‘ON’. Replace switch or toggle switch to ‘ON’ position.
9
Using a multimeter, check for approximately 12V between the negative (-) terminal of
the battery [#2] and the PUR wire connected to the pressure switch attached to the
compressor manifold.
Was 12V detected?
YES
Proceed to STEP 10.
NO
Wiring fault between the isolating switch and the pressure switch. Replace wiring.
10
Using a multimeter, check for approximately 12V between the negative (-) terminal of
the battery [#2] and the YEL wire connected to the pressure switch attached to the
compressor manifold. Test while spade terminals are still connected.
Was 12V detected?
YES
Proceed to STEP 11.
NO
Pressure switch fault or tank not de-pressurized.
Replace pressure switch or drain tank.