Hi, I am having a problem yet again with my dash and brakes lights that go out when I turn on my light switch. I had fixed the problem previously by simply replacing the fuse and it worked just fine. However it has gone out again and this time I have tried replacing the fuse with a new one and I put it in and then turn on the light switch and it doesn't fixed anything however it just blows that new fuse. I have no clue what the problem is? Any help is awesome! Thanks

 

That is a ground fault. it could be in the switch itself or the wiring harness between the switch and the lights (could be front or back). Have you installed anything at all on the truck in the past or had any work done to the truck?

What is happening somewhere is a "hot" wire is coming into contact with a ground source... another wire, switch contact or chassis / body. It will blow the fuse every time.

How good are you with a multimeter? Check all the light sockets and housings for a loose wire which may be contacting nearby metal.

 

"have tried replacing the fuse with a new one and I put it in and then turn on the light switch and it doesn't fixed anything however it just blows that new fuse"
That's a good clue
definely a positive wire shorting. I'd look at the bulbs first: pull all the bulbs out, then put a new fuse in. If it still blows, check the bulb connectors for corrosion and the wires for chafing. If they ceck out OK, then use the Ohm meter into the bulb holder: the resistance reading should be "infinite" (if there is no power to the lights; if there is power, then the Ohm meter blows!) when you find a bulb holder that gives you continuity, you have found the branch that shorts. Repeat the continuity test on all the holders (don't assume that there is only one short)

SD

 

Amen!!!

I could not agree more. If you DO assume that, you will get very frustrated very fast.

 

Thanks guys, I will try and check that out tonight if I get a chance. Thanks