So replacing wiring harness and the headlamps have a three wire plug on em.

Was in bad shape so I got a new plug from Dorman.
Comes with three pigtails already wired to plug.

I wanna splice them into the new harness, but don’t which of the three spade prongs on back of light are ground, low beam, high beam.

Any help is appreciated.

OlD harness is already removed from vehicle… was very bad shape.


1952 GMC model 473 dump truck
1951 Chevy 1500 stepside