Re: 1993 chevy G30 motorhome. My Park interlock does not work. I can shift with out using break pedal. There is no power to the solenoid actuator at the searing column and no continuity or resistance across the solenoid Leeds. I am looking for a complete diagnostic procedure so I don't miss any thing. I thought the safety neutral switch would be a good start as the reverse lights don t always work unless I move the shift lever on the Column to just the right spot.