Back up light switch.. Different color wires, how can I tell

How can I tell which is the positive and negative on something like the back up light switch? If I plug it in wrong will it just not work, or will it burn something? Under the cab, on the rear harness, are two little connectors for the back up light switch. There is a red wire, and a green wire on one side, and a red/orange stripe wire, and a yellow wire on the other side. The manual only labels the color of one side, so I'm guessing I connect the red to red/orange wire, but what if I'm wrong? I have a multimeter, but Idk what kind of test to do for this. Noob question I know, but I've had enough electrical problems recently. Thanks

1983 b2200 diesel

Use a Test light just see which one has power to it I'm assuming that it has only one hot and one ground wire... If not my bad please don't call me a dumbass

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The back up light switch on the transmission is NOT grounded to the transmission, it's simply a contact switch actuated by the transmission internals, just a closure switch. So it really doesn't matter which terminals go where of the two.

Pretty much all vehicles have a similar set-up.

Thanks guys!