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I am unable to locate the wire for the back up light on my 4500. Trying to install a back up camera and need to find the reverse wire or back up lights. I have been told that it is light green. Any comments?
Thanks in advance
 

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You can find that pin out in the 12 pin Body Builders connector along the inside of the right frame rail a foot or so behind the cab. Pin "L" is a Lt Green wire and is a back up signal just for your type of application.

Here is the link to the electrical schematics in the Body Builders Guide.

http://www.gmupfitter.com/publicat/2006_BB/2006+_MD_C_Elec.pdf

You will need Adobe to open it.
 
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