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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 ----------------LincolnTown Car Radio stereo
1989 Plymouth Sundance Car Stereo Radio Wiring Diagram.
Car Radio Constant 12V+ Wire: Pink Car Radio Switched 12V+ Wire: Red/White Car Radio Ground Wire: Back Strap Car Radio Dimmer Wire: Orange/White Front Speakers Size: 5 1/4? Front Speakers Location: Doors Left Front Speaker Wire (+): Green Left Front Speaker Wire (-): Green/Yellow Right Front Speaker Wire (+): Purple Right Front Speaker Wire (-): Purple/Yellow Rear Speakers Size: 5? x 7? Rear Speakers Location: Side Shelves Left Rear Speaker Wire (+): Brown Left Rear Speaker Wire (-): Brown/Yellow Right Rear Speaker Wire (+): Blue/Red Right Rear Speaker Wire (-): Blue/White
1989-1990 And Newer
AS VIEWED FROM MATING END OF CONNECTOR
A B C D E F G H I J
K L M N
Typical GM Factory Typical New Radio
Pin What It Is In Dash Wire Color Equivalent Wire Color
A Left Front Spkr (-) Light Gray White w/ Black Stripe
B Left Front Spkr (+) Tan White
C Right Front Spkr (-) Light Green Gray w/ Black Stripe
D Right Front Spkr (+) Dark Green Gray
E Ground Wire Black Black
F Not Used
G Headlight Dimmer Wire Gray Orange (if available)
H Power Antenna Turn On Pink (if available) Blue
I +12 Volt Ignition Wire Yellow Red
J +12 Volt Battery Wire Orange Yellow
K Right Rear Spkr (-) Light Blue Purple w/ Black Stripe
L Right Rear Spkr (+) Dark Blue Purple
M Left Rear Spkr (-) Yellow Green w/ Black Stripe
N Left Rear Spkr (+) Brown Green