Source for Good Electric Components

I swapped around a few relays in my 2002 Silverado when I was in the middle of nowhere under a rural telephone line run and the starter didn't do ****. WTH? Seems there is a fuse that operates the starter relay. I swapped both and it started. Saved me *** that night. I like the modern " power distribution panel" out of minivans or trucks. Lots of goodies and protection that you can adapt.