Start by replacing the fuse with a 12 volt light bulb such as a brake light. Then you can unplug things to find which ones make the light go off or dim indicating the short is removed from the circuit.

Answered by caradiodoc (expert)
17,633 answers provided

Go here: http://www.google.com/search?sourceid=navclient&aq=1&oq=finding+a+short+circuit&ie=UTF-8&rlz=1T4GGLS_enUS407US407&q=finding+a+short+circuit+in+a+car#q=finding+a+short+circuit+in+a+car&hl=en&rlz=1T4GGLS_enUS407US407&prmd=ivns&source=univ&tbs=vid:1&tbo=u&sa=X&ei=z8t-TdaKN43ksQPjt-T1BQ&ved=0CFsQqwQ&bav=on.2,or.r_gc.r_pw.&fp=4db05700009e71d0

Answered by rasmataz
68 questions asked

Don't you love the way those links work now?

Answered by Wrenchtech (expert)
14,825 answers provided

i blow a fuse only when i turn on the headlights

Response from rjhiggins
3 questions asked

What fuse is blowing?

Answered by PROTECH1980 (expert)
945 answers provided

tail lps 20 amp

Response from rjhiggins
3 questions asked

Do you have a trailer wire harness? Check that make sure it isnt pinched or rubbing on something causing a short to ground.

Answered by PROTECH1980 (expert)
945 answers provided

no what else could it be

Response from rjhiggins
3 questions asked

Like carradiodoc stated, your going to have to make a short checker, get yourself a wiring diagram and start unplugging bulbs etc. circuits/ and anything on that circuit, It is a process of elimination to find a short/ It will take time and testing. Anybody can guess at it, but it is you that is going to have to do the testing. I cant locate a good diagram for you, maybe one of the other guys can find or post one.

Answered by PROTECH1980 (expert)
945 answers provided