08 denali air ride problem

[PaintProsDenali]

I'm lost on this on....compressor is not coming on fuse is good....pulled compressor out and hooked power to it and it works fine...plug back in and get nothing...no dash lights either with it plugged in or not...took a test light to the white wire and blue wire going into the solenoid and they have power and it clicks but never got any power to the red compressor wire which powers it....I'm lost

 

[Goodinblack]

Need to look up a complete wiring schematic to trace the red wire back imo

 

[Magek]

There's a relay that controls power to the compressor. No idea where it's located. Several posters have had to replace it or repair wiring to it.