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I used one with my 96 Ranger. It has seperate turn and brake lights on the rear. (Red brake, orange turn). The adapter fixes this for the trailer and only runs one wire back to each light and uses both for brake and each for the turn signals.
For me it was worth the extra cash and not having to buy a seperate adapter for the brake turn signal issue.
Are you sure you don't have a trailer plug already? Even some equiped with the trailer plug are hard to find. Took me about 5 minutes. Ford hid it real well.
On my 99, the harness connector was located to the left of center, looking at the rear of the truck, just behind the bumper close to the end of the divers side frame rail.
The socket was tapped up to the existing wiring harness, so you have to get under there & look kinda closely, to find it, as bigrigfixer said, they hid it pretty good!!!! LOL
Try the dealer for a Ford "trailer tow jumper harness". For my 99 Ranger it has P/N XL54-13A576-AA & was supplied with the vehicle.
It's designed to fasten to & is held in pace on the factory hitch, with the supplied bracket and self taping fastner & plugs right into the factory wiring harness on one end & the standard flat 4 pin trailer connector plug will go right into the other.
The factory connector also comes with a fold over cover, to keep debries out when your not towing.
Nicely done package, easy to install & has worked well for me over the past 6 years now, & I do a good bit of towing, late winter to late fall!!!!