What would be the cause of ford 1999 contour over drive light not come on and off when you press it and how do you check if the switch is working?
Check to see if the bulb in the dash is burned out or not. The answer to your next question is for a mechanic. Remember to disconnect the negative side of the battery before working on the dash.
What would be the cause of cruise control not working nor does the light on the dash come on this is on a 2003 Chevy silverado?
What would cause the cruise control to stop working on a 1997 Mercury Tracer not a fuse is there a sensor?
Could installing an aftermarket radio on a 1996 Subaru Legacy be the cause of the dash lights interm wipers dimmer switch etc to stop working The fuses all check OK?
Usally not. The only link I see is that these are usually on the same fuse. Ohm check the fuse. Also check that the dimmer switch just isn't disconnected or turned off\down. -edit- Possibly - I installed an aftermarket stereo on my Subaru Loyale (1990) and had the same symptoms you described. After troubleshooting for months, I discovered that during the stereo installation I fried the actual dimmer switch. When I replaced that, everything came…