Did I fry the electrical system?

[Don Burger]

I am working on a 2004 sierra, and switched 2 relays in the fuse block under the hood. The relays were the a/c compressor with the horn relay, right below it. Both the same relays. NOW, the whole electrical system flickers. The system seems to be constantly going thru a reset process. No, it will not run. I plugged in another ecm and bcm, with no change at all.

[Colossus]

Bumping back to top of forum

[Don Burger]

Not sure what that means Colussus?

[carkhz316]

No you didn't mess anything up by switch relays. Check battery cables, and test battery. I'm guessing your work disturbed a cable possibly.

[Don Burger]

After all, it was the battery. I freaked out, spent 60 bucks on the pcm and bcm modules, then CARKHZ prompted me to put my boat battery in the truck...what a relief!

Thanks for the advice!!!!!!

I would have never thought switching a relay would have caused this.