Blowing taillights fuse?
 

What is wrong with my truck it keeps blowing the taillight fuse as soon it makes contact it burns out it happenend all the sudden as i was driving on my 67

Re: Blowing taillights fuse?
 

my 81 pick-up did that once... turned out that when I installed my rear bumper, I pinched the harness under the bracket and grounded the tail light power wire straight to the frame. Have you put anything on recently? If it is blowing the fuse as it makes contact, you have a short somewhere

Re: Blowing taillights fuse?
 

check the harness from the front to the back inch by inch especially where it is held in place by the clips and also if there are long abandoned trailer hacked up harness pigtails

Re: Blowing taillights fuse?
 

this fuse also runs the brake lights, parking lights, and dome light.
If it blows when you first put the fuse in, then it is probably (99%) going to be in the dome light circuit.
While under the dash, look by the fuse block. There should be a plug with one orange and onw white wire. If memory serves it comes out from behind the fuse block its self. unplug that, and put your fuse in. If the huse doesn't pop, then you need to follow that wire up to the light. The orange is hot, and is hot all the time. The light is controlled through the white (ground) side of the circuit. Most likely the orange wire is corroded and shorted under the door sill plate on the drivers side.