VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: www.kb.vmacair.com
10
Ensure the VMAC Warranty Registration has been completed and
the System Identification Plate and Operating Instruction Label are
installed prior to proceeding (see page 8 for details).
Preparing for Installation
VMAC provides material to relocate the vehicle batteries from
the engine bay to the driver side frame rail. Depending on the
application, the end user may wish to relocate the batteries to an
alternate location (see page 49 before continuing.
Do not use a test light to probe for power on vehicle circuits, the
increased current draw of the test light may damage components.
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Locate the blunt-cut OEM SEIC wire harness, on the passenger side in the foot
well. Find the transmission park signal, (Grey wire with Brown stripe).
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Use a multi-meter to verify the transmission park signal. Turn the key to the
“IGN2” position but do not start the truck (on vehicles equipped with a “START”
button, depress the button but to not apply the service brake) to supply power
to the dash display. The resistance to ground should read close to 0 Ω in
“PARK” and open circuit in all other gears. If this is correct, put the vehicle in
“PARK” and turn the ignition “OFF”.
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Mark the transmission park signal wire for connection later in the “Installing the
Control Components” section.
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Disconnect and remove both batteries.
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Remove the lower bumper/air dam to improve access.
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Remove the top radiator cross member cover.
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Remove the (×8) bolts securing the grille and pull gently to remove the grille
from the vehicle.
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Remove the driver side headlight. The headlight is mounted with (×4) bolts, 1
bolt is hidden behind the rubber trim between the fender and the bumper.
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Drain the primary and secondary radiators into separate, clean containers. Set
the coolant aside for use later.
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Remove the intake air box and cover the engine-side port to prevent debris
entering the engine.
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Remove the ground strap running between the battery and the inner fender to
improve access.
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Remove the passenger side battery tray, intake snorkel, and lower duct
assembly.
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Remove the secondary coolant reservoir.
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Disconnect the ‘hot’ side ducting from both the turbo and the Charge Air Cooler
(CAC) and set the ducting aside for modification.
