wiring backup lights to trailer harness

[slemmer]

Hey y'all, I tried to install a set of H3 55W fog lights to act as supplemental reverse lights during the dark nights. I thought it was a straight forward install - one wire to the light green (center pin) for reverse and the other to the black wire (-ve). I thought by tapping in the trailer harness it would provide a convenient source for the reverse function.

 

To my surprise, it didn't work. I'll be checking the connections and pin outs tomorrow, but I do have a couple of questions: 1. is the factory 7-lead trailer harness connected to a factory relay? If so, then I won't have to install a separate relay. 2. If not, is it correct to meter +12v with the light green reverse wire and the black ground wire, or do I need to hook up a relay using the Red +12v wire and using the Light green wire as the signal lead?

 

Thanks

 

[sonjaab]

There should be a back-up light pin in the trailer harness

plug. Prob need a test light anyhoo.....

Check this site for a pin out diagram:

http://www.marksrv.com/wiring.htm .......................geo

[3500in nc]

ok just somthing to check in ur underhood fuse box i know for the aux pin aka backup light pin u have to install a fuse

 

its in ur owners manual i think its either bank 1 for gas engines or the one to the far right for deisels

 

hope this helps ya sry i cant seem to remember the names of these things (man im glad i just got home from work lol)

 

 

u may want to try just grounding out the lights onto the trailer worked for me

[sonjaab]

The placing a maxi-fuse in stud #1 in the underhood fuse center

only controls the underhood light (if so equipped) and the hot

power pin in the trailer harness/plug.

 

The back up light power in the trailer harness/plug should work

without it........................geo