found fuse behind battery but when i change it it blows right away, brake lights work and turn signals??

 

what have you changed to the car before it started to blow?

 

nothing, just the wheels?

 

That line must be grounding out somewheres. Start inspecting that line from beginning to end. I would start by removing the taillights and look for anything wrong with any wires. Swelling, corrosion, cuts, fraying, anything.