Hey, I got the wierdest prob...  This truck has head light and the front marker lights and break lights.  But when you turn the head lights on there is no tail lights... Now here is the weird thing. you turn the turn signal switch up and the tail lights come on. you turn it down and the emergency flashers just in the back come on.. I have replaced the turn signal switch and it did nothing, also changed the head light switch and that did nothing.  I have took the foot switch for changing from low to high beams and cleaned the terminals and nothing... I even saw on the net that the em switch can get dirty and cause probs and if you spray wd-40 in it and move i back and forth it will fix it and that did nothing. The lights used to work fine then the truck sat for a little and now they dont.  Also i have changed the bulbs checked the relays for the em switch and turn signal switch and they are good. I have traced the wires and did not really find any thing wrong. You guys have any other sagestions?