Car guys who are good at electrical: got a question for you.

[notfred]

What are probable causes for a truck that keeps blowing out the same two fuses repeatedly?

 

[flot]

A short.

What are the fuses?

 

[notfred]

Turn signals and brake/backup lights.

 

[stevens]

bad ground but that probobly would just cause it to not work
a short is most likely

but we need to know what fuses and what kinda car (year and model)

EDIT: If you have recently replaced the bulbs they could be the wrong one. THey could be drawing too much current and causing the fuses to blow. Check to make sure their the right bulbs.

 

[brxndxn]

Did you recently change on the bulbs or bulb? If you throw in a bulb that has too high of a current draw, you can short it.

 

[flot]

Has the truck been in any accidents? Could be some sheet metal sliced into a wiring harness going back to one of the taillights. Take the taillights out and examine any visible wires for signs of damage... also have you checked to make sure all of the bulbs are working? Could be a single bulb or socket has somehow developed a direct short to the body and that's causing the issue. If any of the bulbs show any visible signs of damage, replace with new. You may as well just go buy a set of all new taillight bulbs and replace them, you'll be taking everything apart anyway.

 

[notfred]

It's a '74 F100 pickup. It's never been a serious accident (the driver's door is dented and the back bumper). I don't know what bulbs are in it, I jsut got it. When the fusr isn't blown out, all the lights fuction properly.

 

[NutBucket]

I'm gonna go with a shorting wire. I know that's why the fuel guage in my buddy's classic Mustang is all over the place.

 

[Ornery]

Check the bundle of wires, coming up the steering column,, for rubbing against the gear shift (it is an auto, right?) I'm just guessing based on which fuses are blowing.

 

[Quixfire]

Tyler, when do the fuses blow? What are you doing when they go out?