A odd thing even for a chevy.

[67440chrg]

I have a very low millage 1991 S10 59000 miles. It sat in a garage most of its life. I am driving it as a daily driver now. The other day every time I opened the door the radio would change stations. It would just go to off station all static. Then I noticed it was the dome light that did it. With a little head scratching and checking everything else I noticed the horn had quit. At this point I was getting concerned. I am not good with wiring problems. I checked the fuses and changed the horn fuse and everything is back to normal. A mechanic friend told me it may have been somehow back feeding from one circuit to another. Strange to me but glad its all good now.

 

[oldbee]

It sounds like your ground to radio may have gone away.

 

[SSmoothie]

Find all the grounding points of frame connections and clean them. And check your dash grounds.

 

[66383]

Check around firewall area, the harness was so close to the firewall sometimes it rubbed..S-10's & S-10 Blazers are famous for this. Ask me how I know.