I purchased a heavy duty headlight harness from LMC for my 1965 C10 fleetside when I upgraded the head lights to halogen's. I have single headlights. The new harness is supposed to be plug -n-play, no cutting or splicing? The new harness has a square plug, 3 male prong's that is supposed to plug into the existing warning harness that is round with 2 male prong's. Any sugestions. Do I need the heavy dutyharness for the Halogen bulbs?
