trailer wiring help

[07rangerfx4lv2]

hello folks, my trailer running lights refuse to work its the truck end thats not working not the trailer itself, ive tried yelling at it, punching it, kicking it, nothing iwll work. anyways a friend of mine told me i can just ran a wire from the taillight running light wire straight down to the flat 4. my issue is i dont know what wire to tap into on the tail light wiring. does anyone know which is the running lightwire of the top of there heads? thanks

 

[kimcrwbr1]

http://www.therangerstation.com/Magazine/spring2008/93-97_taillight_upgrade.htm
Found this here hope it helps?

 

[martin]

If you trace the trailer connector back to where it joins the truck harness you will probably find a corroded connection or broken wire.