2005 2500hd won't crank

[Nathan Bierer]

So the problem I am having is I recently purchased a non running 05 2500hd. The person before me tried to install a radio and I swear he was color blind. Hooked up about 5 or 6 wires wrong, wouldn't turn over after that. Everything powers up, crank fuse works when key is turned, starter relay doesn't click(yes I've switched them). Jumped relay and starter turns freely, I thinks it's the bcm, any suggestions please?

[davester]

subscribe to the full-service manual for your truck, and go through the diagnostic procedure for your no-crank problem.