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We have a Ford 1996 F250 heavy duty pickup with a 7 wire trailer wiring connector. We have a Ford 2004 Expedition with a factory 4 pin flat connector. We have a boat trailer with a 4 pin flat connector that has a 7pin adaptor that can be used for connecting to the truck.
The problem is that the boat trailer is only 4 pin for both, but when connected to the truck, the marker lights all work. When connected to the Expedition, the marker lights do not work. Previously we had an Explorer and the marker lights did not work on that either.
The tech forums are the best way to find the information you need. Just click on the Forums tab at the upper left and scroll over the list. The towing forum might be the one for you. The brakes would not work on my double axle trailer so a took it to a guy that sold trailer supplies. He pulled out a mess of pigtails and started plugging them into the plug until he got one that worked the way it was supposed to. He said I need to move the wires in the plug on the truck. A little time with a ohm meter or test light should get you going.
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