i bought this truck a month ago and the instrument lamps didnt work. i was pulled over and informed my tail lamps dont work either. i checked the fuses, and the instrument lamp fuse is good. the 10 amp park lamp fuse is blown, and when i put one in, it works fine. until i turn my headlights on.

so i changed the headlight switch out for a different one. the fuse still blows. any ideas where i could look to check for a short in the wiring?

 

dome light?

 

i dont think its the dome light because the dash fuse is good, but the park lamp fuse is no good.