Check the switch to make sure it's working/connections are tight. Could also be your solenoid, located on the final drive assy. Check the resistance...should be 37-43 ohms. If not, it's bad. You can also connect 12V up to the solenoid and you should hear it click. If it is clicking you can check the hoses for air flow out of the solenoid. See pic...A is with power applied to the solenoid; B is no power. If the air isn't flowing the solenoid is bad.
Hope this helps
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