Re: Fuse keeps blowing and truck wont start :(
The harness can get rubbed through and it's hard to see without moving it around to look. It runs a lot of component, even the O2 sensor heaters. If you don't have a diagram, you could go to Autozone to get possible one and unplug everything that it shows on the engine, Then start plugging them back in until it shorts again and that would be the component that's shorted. I'd bet it's the harness though.