The Guessing Game!!!
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Methinks you have a universal wiring harness in that truck. Manufacturers do this to keep costs down. That plug may be there for an optional item when the truck was new. Like, for instance the tach. wire in the dash. Not every truck had a tach. installed but the wire is in the dash harness in case you want to opt for a tach. later on. Hope this helps you.....Ernie
I'm gonna have to go with probably universal. 5.0? On the same side as the coil? If so that is where your air solinoids (like for the vaccume operated EGR valve and other thinfs) went on earlier models. Like 3 of them. Usually though I see manufacturer's put a plug over unused wire harneses. Like the one over one of my 2 wire haeneses used in my 5 speed manual transmission.






