have a 04 dodge dakota quad cab 4.7 with the factory tow package. towing a small utility trailer today, i noticed that when the trailer is plugged in, the trailer lights are on all the time, even with the ignition off and the truck's lights off. i have the factory 7 pin plug on the truck and im using a mopar 7 to 4 pin adapter. is this normal for the lights to be on all the time? some sort of safety deal? or is there something wrong with the wiring on my truck? its kind of a pain to have to unplug the trailer every time i shut the truck off so it doesn't drain the battery.