2000 GMC K2500 old style

jmducks1 · Apr 25, 2009

I have a 2000 GMC K2500 With 5.7L old style. I am wiring up trailer plug to a RV 7 plug.and found the factory harness. It has 5 wires green left blinker, tan running lights, yellow right blinker, light green?? and big white?? is ground maybe? what is the light green and are the other ones do I have right??

usetob · Apr 25, 2009

go to marksrv.com, very good site on wireing

Eric W · Apr 25, 2009

Auto parts store should have a harness that tees into your existing harness, makes it simple. I wire boat trailers all the time at work. On a trailer:
Brown=running lights
Yellow=left turn
Green=right turn
White=ground
Not positive if it is always the same on trucks. Check the one you don't know to see if it goes with reverse lights. 7 way RV plug has that for surge brake lockout solenoid.

jmducks1 · Apr 26, 2009

thanks for the tips still unsure on the light green? white i would think would be ground.

KCTractors · Apr 26, 2009

Just got done working on a 92 GMC 1/2 ton, the light green was signal light and the dark green was back-up lights. Didn"t have a white, but I would think that would be a ground wire.

2000 GMC K2500 old style

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