Peterbilt clearance lights

Headlight switch on head lights work dump body lights work trailer running lights work with blinker and stop lights


No trailer clearance lights


Cab light switch is on everything works as should clearance lights on truck clearance lights on trailer brake lights turn signals everything works


Turn both switches on and it’s all just fine


I’m basically mowing one of my 12 volt pins when the head lamps are on



any idea where to start 96 357 peterbilt with a 3406c model