The multimeter is named such because you can measure AC voltage, DC voltage and Ohms with the same meter. Assuming it is a digital meter, (if I am wrong let me know), you can set the meter to the ohms scale and it will beep at you if you touch the two leads together. If you can set it to do that, that will be the most helpful. That beep means a very low ohm value which is what you are aiming for. So if you touch one lead to the end of one of the wires, and touch the other lead to the same wire on the other end, it should beep at you. This means the wire hasnt been cut or damaged, and it also means you have the right wire! In other words, in a large wiring bundle, you can put one lead (doesnt matter which) on one wire, then to FIND the other end of the wire, touch all of the wires until you get your beep. Easy Peasey right?
This is of course wires only. If there is a light bulb or something else attached to it, all bets on the 'beep' are off. This is really the most elementary of the uses of a multimeter. There is MUCH more to it. If you have other questions, askem here. If I am wrong, others will be more than happy to correct me.
This does not help you get the correct wire to the correct place other than identifying the wire you are working with. You need the wiring diagram for that.
