91 2455 w/b230f auto 265k - did a search but cudnt exactly find answer to my question. gunked engine compartment today and after cleaning found oil pressure sending unit without a wire connected to it. at same time, found a wire hanging off the alternator with a male, bullet end to it. seems this wire wud reach the pressure sending unit and even looks like the bullet end wud fit in the end. but this it's not logical for the wire to go there so i didnt even attempt that. where does that wire go to, and where does the wire for the pressure sending unit come from? tks again all.
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oceanre 91 240 wagon 260k

tks guys, i'll see where the bullet style connector wire goes into the harness and hope to have a loose gblack wire inside the harness that goes to the oil pressure sender. just wondering, if there is no wire to my oil pressure sender wouldnt i get the oil warning light on the dash lit up all the time? mine only comes on with the other dash lights when i turn the ignition on and then they all go off once car starts.
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oceanre 91 240 wagon 260k

The light comes on in the dash when the sender shorts to ground. So unless the wire to the sender is shorting out somewhere to ground, then the light stays off.

The wire for the oil pressure sending unit comes out of a harness that also contains the exciter wire for the alternator. This maybe what you are seeing. If the wire that is loose is indeed connected to a terminal on the alternator, it does not belong on the oil pressure sender.

The D+ wire is red and has a spade connector on it the oil pressure sending unit wire is black and has a bullet style connector on it. They both come out of that end of the harness along with the big fat red B+ wire that also goes to the back of the alt.

Mark