exhaust sensor

Hi all - Got a code: "P0171 system too lean bank one" so, took truck to the Auto Skills Shop on post, (where we military types can do our own work and get access to shop tech and tools) The dudes there looked up codes and confirmed what I thought which was Oxygen sensor. Replaced Oxy sensor...

So this o2 sensor is on the outside of my Exhaust manifold and the burnt wire I can not find where it plugs in at? I can see where my other 2 are connected on my pipe before and after the cat, but this one baffles me, I have a 95 Ranger XLT 2.3L 227,*** miles, I tried google and lookin' in a...