Apparently while cleaning my truck i noticed this connection loose. I don't know where it goes but here is the problem. When i start the truck it doesn't start all the way. Then when it did start it sounded fine until i put it in gear (manual) it sputtered like hell. I thought i got some water in there somewhere so i replaced the oil, oil filter, fuel filter, valve cover gasket. All of this from cleaning the engine. Oh, yeah i only cleaned the engine because i was replacing the hoses to my power steering pump. the harness is a thick bundle that goes from left to right to the fender wall where there are a lot of connections. Off of this bundle is a single tributary harness with a two prong female connector. This tributary connector is my delima.

1989 Ford F150, manual AX4N, 5.0

 

There are lots of us that have cleaned an engine compartment and I've had my share of problems there too.! With the vehicle of those vintage years I only had to remove the plug that connected to the ECM and allowed it to dry or blow dry it and the problems were gone. This may or may not help , but it is worth mentioning.

 

Last night i went through the engine compartment double checking those electrical connections and dryin out any that showed a hint of a drop. Apparently it worked, so I am good on that part. I am still a little perplexed regarding that loose wire connection. The PS pressure sensor makes sense, but i swear i haven't seen that wire just dangling there as i stay under that hood. My old pressure line had no switch or connections on it. I would have seen it. The new line had a special hole on it where the switch would have gone, and there were plenty of instructions mentioning it. But if it didn't, they provided a plug, and I plugged it. So does it make sense to add a pressure sensor? what does it do?

 

Many times a floating plug is for some accessory that just is not on the vehicle.
You might consider trying this;
There will be only so many places for that plug to reach and most of the time the wires are not stretched to the limit. Instead of looking for the perfect connection which may not even exist, look for a component that has the mating connector within reasonable reach. If you can't find one , it might be for some accessory that is not on the vehicle. If it runs and operates satisfactorily you may be on a wild goose chase.