Just installed a used BOSS 8'6" super duty straigt blade on my '00 Chevy silverado 2500. All plow functions work fine as in up,down,left and right.The problem comes when I flip the switch from "TRUCK" to "PLOW" lights. The truck lights go off,parking lights stay ON on the truck but the plow lights do not come on. Also the high beam indicator on the dash will illuminate but wont flip to low beam.I do have left and right turn signal on plow and have determined headlamp bulbs plowside to be good.With the switch flipped to "TRUCK" all light functions work properly on the truck. I have verified good battery ground for the truckside harness and good power.I have also triple checked the headlight harness adapters for proper orientation which is "B" up.With the truck ignition on lights to the on position and switch flipped to "PLOW" lights I have battery voltage at plow light bulb plugs,both low and high beam plugs which I think is odd.I have hooked another truck to my plow and all lights worked fine so i have determined it to be truckside. I have a 4 relay harness and removed all relays and replaced them with known good ones and still no plow lights.Plowside 13 pin plug is new,ground at plow motor is shiny and corrosion free. I dont know where to take it from here please HELP!
Last edited by BobTwardowski; 11-19-2012 at 06:52 PM..
Your headlight adapters are configured correctly if they're on the "B" side. But quadruple double check them again as that is the issue 99% of the time.
Also check the vehicle option connector in the main harness to be sure it's in the standard orientation. Being a used setup the last vehicle it was on it may have been configured for reverse orientation which will create the issue you're having too.
Rechecked light adapter orientation, "B" faces locking clip on all plugs and gray is plugged to gray and black plugged to black. I also varified the vehicle option plug to be in standard configuration.