I'm having a similar issue weeds.
I have mine mounted under the drivers side seat box. The wiring harness is tied up above the transfer case with feed wires running to the starting battery and trigger wire to the switch inside cab.
Lately my compressor has not been turning on. I'd flick the switch and nothing. Then i'd jiggle the wires a bit and presto it would run. So I can now assume I need to get under car and clean up the connections in the wiring harness that sit above the transfer case.
The wiring harness provided by ARB is quite long so I have it all bundled up with cable ties.
Andrew
1998 Landrover Defender 300Tdi 130 HCPU Expedition
1972 Peugeot 504 Sedan - Daily Driver
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