I purchased a 2009 Ford F150 last fall and my running lights on my PUP don't come on when I hook it up to my truck. The brake lights and turn signals work, but not running lights. The truck lights are set to automatically come on when it gets dark enough, but even if I switch it to manually be on, I get no running lights. I hook it to my wife's SUV and the running lights work. Is there a problem with my truck wiring or is this a product of how the truck lights work?