The truck has a new American autowire harness installed with LS3 motor and all new LED lights. I have tested the brake switch with continuity to verify it’s functioning. When I unplug the column turn signal wiring lights go to normal. When I swapped to a new turn signal switch the lights behave the same.
When I unplug the brake switch verified I have hot power on orange wire and no power on white. With ignition on the white wire on the brake switch connector shows a dim light on tester.
When I test the rear body harness wiring mentioned in the thread previous tips everything tested fine.
Headlight switch off with ignition on: brake lights and blinkers work normal
Headlights switch on: brake lights work normal
Headlights and ignition on: only blinkers work and lights are on as if brakes are engaged.
http://http://https//api.americanautowire.com/shopify/instructions/92970223%20510347%20IN%202.0.pdf