2005 Sport Trac factory 4 pin trailer wiring

[smalltownusa]

Just finished running new ground leads to my new LED trailer lights.
Looks like my 4 pin factory light connector is really corroded, as wiggling the connector causes the lights to go on and off. Tried cleaning it, but years have taken its toll.
I know I've got to get under there, and get some rust on my face, but before that I was wondering if I want to replace that connector does it "wire" up somewhere in the rear of the Sport Trac? Maybe behind on of the lights. I hope it's not continuous all the way to the front of the vehicle. I'm not a fan of splicing.

 

[koda2000]

My experience with Explorers (not my Sport Trac, as it already had the factory 4-pin harness when I bought it) is that there is a plug behind the driver's side tail light. I imagine the ST would be the same, so other than for the pigtail routing you shouldn't need to get under the truck. Remove the LH tail light and look inside the hole and you should see where the trailer pigtail is plugged into the tail light harness.