my headlights are always on when the ignition is in the run position and the switch is off. I've just replaced the switch and it didn't fix the problem. Does anyone have any tips on where to start looking for wiring problems?

 

Need more info...

Year, engine size, 2 or 4 wheel drive, etc of your truck.
Do you have a Canadian model with DRL's?

 

2001 5.9 magnum 4x4

 

Doesn't the 01 have daytime running lights?

 

I'm not sure? I just thought something was wrong because my lights are ALWAYS on even if the switch is off

 

Are you in Canada??

If the lights are on all the time, but, go off with the ignition, then you probably have daytime running lights...... If you are in Canada, that's a certainty.

 

Just a FYI, daytime running lights have been mandatory here in Canada since 92 I believe

 

I'm not in Canada

 

I would get the build sheet for your truck and see if it came with DRL's.

 

Okay, how do you get a build sheet?