My car is a 92 LS-L, the wiring diagram corresponds to what I see when I looked at my car - two white wires going to the plug. If it helps the thinner wire is at the top of the plug looking down on the alternator. I couldn't find a + or - symbol. If you tell me where to look with some detail I'll go look again - keep in mind this is by flashlight for me so it has to be fairly easy to spot.
attached is a print of the diagram I have
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