Wiring diagram for headlights 02malibu - 2002 Chevrolet Malibu

Wiring diagrams.

https://www.google.com/search?q=2001+gmc+2500hd+headlights+wiring+diagram

and

https://www.google.com/search?q=2001+gmc+2500hd+headlights+wiring+pinout

Plus

https://www.alldata.com/diy-us/en

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They are an aftermarket addition.

https://www.google.com/search?q=2014+Dodge+Ram+2500+HID+projector+style+headlight+wiring

https://www.google.com/search?q=mobile+auto+electrician+near+me

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For wiring diagrams it is hit an miss. You really need the workshop manual or post to the Ford Forums

Click on the images tab.
https://www.google.com/search?q=%222011+Ford+Escape%22+headlights+wiring+diagram

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Find a wiring diagram (www.bbbind.com) free wiring diagrams . Then go to youtube an check out Eric the car guy's basic electrical trouble shooting . An there are one's for understanding wiring diagrams . Learn voltage drop testing also.

According to my wiring diagram, the headlight switch works a relay which is powered by two different fuses.
I would check the relay for voltage first.
You may need a repair manual to trace the circuits.

The headlight wiring and radio wiring is getting in contact and causing the short.Both the grounds needs to be checked.Because when headlight is off,the radio work's fine.As soon as the headlights are turned on,the radio goes in scan mode.Its clear indication of radio and headlight wiring issue.The wiring's are getting in contact with ant metal surface or both the radio and headlight wire are coming in contact,where they should not.I suggest you to check the headlight and radio wiring diagrams for your lincoln town car.Here is the direct link.Click the link below :---Check out all the 3 links one by one.Radio wiring diagram for 1997 LincolnTown Car?http://technoanswers.blogspot.in/2012/02/radio-wiring-diagram-for-1997-lincoln.html
----------------Lincoln Town Car Radio stereo wiring?

http://technoanswers.blogspot.in/2012/02/lincoln-town-car-radio-stereo-wiring.html
---------Headlight wiring diagram for 1997 Lincoln Town Car?http://technoanswers.blogspot.in/2012/02/headlight-wiring-diagram-for-1997.html
----------This will help.Thanks.

The wiring diagram below shows what you need to end up wiring to make this work, so if you know how to read a wiring diagram and feel like "skipping ahead", just go click on the thumbnail for the wiring diagram and check it out in full size, full color glory. It's shown for a four headlight system - if you have a two headlight system on your car, pretend the two inner "high beam only" headlights aren't there and you'll be fine. The wire colors shown here represent a typical GM vehicle (the green and tan wires, along with some of the black wires) as well as the proper/correct/desired wire colors to use on any new wiring you do (the red and some of the black wires). Also, this is shown as a typical "Bosch style" automotive relay with the connections numbered as such. If your relay is not numbered like this, then just identify the wires by function and go from there.

Note that in the original version of this diagram, I had the labels for the right side headlights reversed - it has since been corrected thanks to a sharp-eyed reader who pointed out the mistake to me. The wiring diagram was always correct, but the headlight labels may have been a tad confusing to some. Apologies for the mistake.

The Haynes repair manuals usuall have wiring diagrams in the back of book.Around $20.

I would go to Alldata.com on line for your vehckle to get the wiring diagrams.

Here's a link to a pdf file containing the headlight wiring diagram for your year model Dodge Ram 1500..
I can't help but notice that you say you've replaced the headlight relay? That's quite odd, because there is NO headlight relay on this vehicle- only a 40 amp fuse located in the power distribution box that sits behind the battery inside the engine bay.
The switch is notorious for burning out because there is NO RELAY on this vehicle, and there is a recall (#819) but this only affects 3500 models even though the headlight wiring is the same for 1500,2500 and 3500 model Rams.
Here are two more links that will help you troubleshoot your headlights problems.
HereInformation on Putting a Relay in the Wiring System