ARB Air Locker Wiring Diagrams - offroaders ARB Air Locker Wiring Diagrams : ARB Air Locker :: ON COMMAND LOCKERS The ARB Air Locker is a unique air operated unit, for which the locking action is controlled by the driver with a push of a button inside the cab. A 12-volt air compressor (24 volt also available) engages the unit in approximately 1 second and can be engaged at any vehicle ARB Compressor Wiring Harness | Marlin Crawler, Inc. ARB Compressor Wiring Harness are direct factory replacements for ARB air locker setups. They are also great if you are supplying your own air source but still need to wire up the electric solenoids. Note: the compact wiring harness does not use a relay.