VMAC – Vehicle Mounted Air Compressors
Toll Free: 1-800-738-8622
Fax: 1-250-740-3201
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4.3 Testing the Safety Circuit
□ Connect the batteries.
On trucks with air brakes, you will have to run the
engine until the air brake system is up to operating
pressure then shut-down the engine before testing the
system.
□ Place the automatic transmission in Park or Neutral or manual
transmission in neutral and apply the park brake. Turn the
ignition key “ON” but do not start the engine.
□ Check the control box to see if there is a number showing in the
hour-meter. If there is no display, there is no power to the control
box.
□ Turn the control box switch to the “ON” position. The green light
should come on and you should hear the compressor clutch
engage.
□ Release the park brake. The green light should go out and the
compressor clutch should disengage. Apply the park brake
again and the light should come on and the clutch should
engage.
□ Shift the automatic transmission out of Park or Neutral. The light
should go out and the compressor clutch should disengage.
Check all gear selector positions to make sure that the light does
not come on unless the selector is in Park or Neutral.
If the truck fails the test, check the wiring to make sure
that all the connections are correct and secure. If you
require additional assistance, contact your local VMAC
dealer. Call 1-800-738-8622 or 250-740-3200.
!
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