Vmac UNDERHOOD 70 Installation Manual page 45

Connecting to Key Switch 12 V Supply
The instructions provided below can be used in cases where no
upfitter switched power circuits (minimum 10 A free) are available.
The VMAC system can be wired using the directions below or as per
GM bulletin UI #148 (Scan or click the QR code).
☐
Locate the junction block located in the driver side foot well, near or below the
parking brake mechanism.
☐
Remove the plastic cover on the junction block by gently prying the (×3) locking
tabs away from the housing to release the cover.
☐
Remove the (×3) nuts securing the junction block (Figure 54).
Top view
☐
Lift the assembly up and out of the way to give clearance to the electrical
connectors on the back of the junction block.
☐
Remove the X1 connector from the junction block (Figure 54).
VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: www.kb.vmacair.com
Figure 54 — Junction block
Bottom view
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