Electrical Problems

[Sandman]

I have a 1998 GMC Yukon. I am wondering if anyone knows of a connection that ties in the blower motor, dome light and stereo eventually that could cause them to have problems at similar times. My dome light blinks on and off when driving down the road. The blower motor is inconsistent at turning on and off. I have an aftermarket stereo that is stuck in protect mode for some reason. Could they all be related in some way? Or, are they just happening at the same time?
Thanks for any help!

 

[TonyBuckets]

my 97 tahoe had the dome light problem, it was the passenger door switch thing that was causing the problem a loose connection in the dash.

 

[SunlitComet]

body ground to frame, engine straps. but chances are the not related based on how you describe them as malfunctioning.