2004 silverado seats do not heat, right window does not open or close and the tach does not work at times. Any ideas?

 

Have you checked all of your fuses?

 

Check your wiring harness. I had a mouse crawl into my truck and chew my harness up. Caused a bunch of problems similar to yours. My problems ended up costing me a new transmission and computer. Very expensive issue. Hope you don't find anything.

Other idea; ground wire may be loose on your fuse panel???

 

Thanks, I will check that out. daveeddy