ok I need some help I plugged in a trailor in my 02 2500 and now my horn don't work my passenger headlight and parking light don't work my driver side head light stays on with the switch turned off my dimmer switch don't work. it also shows I am in four wheels drive and im not, my bight light on the dash wont go off even with the head light switch turned off and my truck turned off. please some help my out!!!!!!!!!

 

Sure sounds like you had a bulb blow and now it's getting ground through the wrong things. Check your brake and rear lights. Do your 4 ways work? if not check each of the turn signal bulbs on the truck. Kinda hard to think it was a fuse, but never can tell. Check them all, in the truck and under the hood.

Where are you in KY?

 

Check your headlight switch for symptoms of burnout. Sounds like it is overloaded and maybe has crisped some of the wires. You must have released the Magic Smoke from at least some part of your lighting wiring harness.

Mike

 

All my fuses are good and all my lights work as they should except the passenger side head light and parking light I put bulbs in them and they blew as soon as I put them in no wires are burned but I haven't pull the light switch yet. And I'm in Harrodsburg ky

 

So as soon as you plug the headlight bulb it, it pops without even puling the headlight switch?

Time to get a meter and see if there is 12V at the socket all the time. I would think it would still just come on if there were only 12V, not blow though. Get a voltage reading and let us know what the heck is going on there.

 

Pat, I think you and I are scratching our head about the same thing. Unless something really weird is going on, what could cause a bulb to blow as soon as it goes in? A fuse would blow instantly with a dead short but a light already IS a short circuit.

A volt meter is the place to start.

 

Yup, I'm grabbing a meter also. It may help to use one of the test probes that light up. Not making sense....

Vine Grove for me.

 

You can't just blow a bulb with 12 to 14 volts unless something took out the pcm and had the alternator give it all she's got. Like a short or a sudden draw through the trailer connector. The lighting is a switched ground system so there should always be a hot wire at the socket regardless switch on or off.

 

is the trailer still connected? did the problems still occur with the trailer unplugged? or is all this happening after unhooked from trailer? just trying to trouble shoot.
Im leaning toward head light switch malfunction.

 

When I had a problem where connecting the trailer would cause a brake light fuse to blow immediately, it turned out to be a cracked trailer connector on my car. I replaced it with a new one and problems were gone. Just an idea.