Hello,
Have you checked to see if you have the factory wiring? Below is a link to a useful article discussing trailer wiring on that model, which gives you thelocation to check and other information. Like you, I have a 98 explorer myself.
http://www.explorerforum.com/Singleton/web/pages/trailerwiring.html
Good Luck!
David
how do I install a trailer lights to a Honda 1998
http://www.modifiedlife.com/1998-ford-explorer-car-radio-stereo-wiring-diagram/ Color codes for factory wiring
You can find a wiring diagram that shows you how to hook up a trailer wiring harness on a 1998 Pontiac Transport at most auto parts stores. A Pontiac repair manual should have the diagram in it.
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The 1998 Ford Explorer fuel system wiring diagram can the obtained from most Ford dealerships. The fuel system wiring diagram can also be found at most auto-parts stores.
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U-Haul sells a kit with instructions
The wiring diagram for a 1998 Ford Explorer XLT can be found in the service manual provided by the manufacturer. If the power windows, moon roof fuses, and power relays are good but the windows and moonroof do not work, then it is likely a wiring problem
Buy KIT at Auto parts, U-Haul or Wal-Mart comes with instructions
disconnect wiring harness, mark hinges, remove bolts securing hinges to body.
Double check that you have a good ground on the trailer and on the vehicle. White wire should be connected to bare metal. Also ensure your trailer tail light bulbs are not twisted in their sockets.
On a 1998 Ford Explorer : You can seeone end of the Powertrain Control Module ( PCM ) in the engine compartment . It passes through the firewall , from the engine compartment end you can see where the wiring harness is bolted to it , and most of the PCM is " hidden " behind the glove compartment