Picked up a project ‘97 F150 XLT 4wd with a 4.6L. Have been correcting a number of issues and finally talked myself into tackling the heater core replacement. Just buttoned it up and remembered where most of the parts, screws, and modular plugs went, but one circled below (behind passenger side kick panel) has me a bit puzzled.
I can’t find the mating male plug and first thought it is for some option this truck does not have, but just not certain. Any help in identifying is appreciated.

.

 

Fuel pump reset switch? Above the harnesses you see on the side wall is the switch...not easy to get the harness in there

Blower motor?

Sorry, not at my truck right now...

 

Thanks. There is a gray plug upstream on the blower motor harness that is almost identical to this blue plug. I did check function of the blower motor and it is ok Thus blue plug has a small positioning boss and push rivet on its side that corresponds to two holes in the metal side panel. It is mounted to the side panel in this picture. Before I plugged it in to the mounting holes, I did stretch out this Modular plug in a 360° to see if anything looked like a fit.
Truck runs fine, everything electrical I’ve tried works. Just can’t recall this plug when I was removing the dash.

 

Think mystery is solved. Decided to go ahead and button up the remaining trim pieces. Picked up the plastic kick panel and noticed some words and arrows molded into the face. One was “fuel pump reset” with arrow, once installed, pointing to the reset module button. The other pointed to the mystery blue Modular plug…..”air suspension”.