Sometime between the turbo install and now, my cruise control stopped working. I thought it could have been Crome, but my tuner said that it isnt Crome.

Whats the first step to troubleshooting the cruise control?

Thanks

 

does the light turn on?
make sure all the hose/plugs on connected on the curis control unit.
check the bypass swith on the clutch pedal (brake pedal if it is auto), adjust the height of the switch if nessery