The only thing I can think of about the extra female would be for a CJ with cruise? Alot of times companies will make one wiring harness for a vehicle and use it regardless of options.
Case in point, my CJ5 which never came with an automatic or quadratrac, has the plug for the Quadratrac warning light in the engine harness.
If I had to bet, thats what I'd say you've got. Check it with a meter and see...it shouldn't have 12+ and likely won't have any continuity to ground.
1973 VW Karmann-Ghia first car
2009 Challenger R/T 6MT, Flowmaster, inTune daily driver
1977 CJ5 304, 3MT - under construction
And many in between!