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If you have the 4-pin connector your '97 doesn't have the towing package, so there won't be a brake controller plug under the dash. Search the 'web under "tow vehicle/trailer wiring" for diagrams and install tips. BTW, without a tow package your '97 tow rating is pretty low - be careful about what you hook to her tail. Good luck!
Steina says:"If you have the 4-pin connector your '97 doesn't have the towing package"
Are you sure about this? My '99 has a factory tow package and it only has 4-pins as well. That is for both the connector on the Explorer and the trailer plug.
By the way, I tried connecting my adpater to an earlier Ford, a '97 or '96 if I remember, and it wouldn't work. I used a DMM to troubleshoot and guess what, the pinouts on the car connector where different. Ford must have changed some wiring in there.
Does your '99 have a 6-pin connector under the dash for a brake controller and a 1.25" hitch? Reason I'm asking is, my '99 with tow package had this connector and a 7-pin round RV connector by the 2" hitch. The 4-pin by the hitch is for lights and ground only - if you have the 6-pin brake controller connector and a 4-pin by the hitch, there are wires and relays missing.
I have installed new lines to the brake controller complete with a seperate on / off switch, pre-wired for a tranny temp gauge and strung new wire to the rear for a new connector.
So perhaps there are different levels of tow packages. My tow package did not come with a receiver and I don't think there are any other connectors. I have not looked for a brake controller plug under the dash, but I have only found the harness connector in the rear and I had to install the factory provided adapter.
I purchased an after-market 2" receiver--Hidden Hitch round tube style. I have not used an electric brake yet on my single axle trailer.