I have a 2002 chevy express LT 5.7 L engine. this was the last year for the factory conversion. when you turn the headlight switch to park lights all come on, engine running, the drl are on. turn the switch to headlamps and the drl stay on. i dissassembled the headlight switch, inspected, cleaned. no signs of problem. i went to the service manual, it shows fuses and there are none on the truck. this factory conversion does not quite match the book i am finding out. can anyone point me in a direction.