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Dan, welcome to justanswer.com
So, was there a switch connected to these wires? Is there a light mounted & wired in the closet? Do you have a multimeter?
Yes, please send a picture. I am guessing the closet light does not work
Thanks, that's the "standard" for mobile homes unfortunately. I recommend that you purchase a one gang cut-in box, aka old work box. They look like this (see link) http://m.lowes.com/pd/CARLON-14-cu-in-1-Gang-Plastic-Old-Work-Wall-Electrical-Box/1098523
You will also need a single-pole switch and a matching 1-gang switch plate.
VERY IMPORTANT - Before disconnecting the three cables from the existing switch identify the single cable by marking it with a sharpie or with electrical tape. This should be the table that goes to the light fixture.
Carefully cut the drywall to fit the new box in. Turn off power to this circuit which probably means you're going to need a flashlight because you will be in the dark. More to follow...
Once the drywall is properly cut for the new box, insert all 3 cables into it with the one that you marked in an opening by itself, the other two in another opening together. All three cables should enter the same end of the box. Strip app 6 inches of the outer jacket from each cable being careful not to damage the insulation on each conductor. Connect all of the bare wires with a wire nut including a "pigtail" that will connect to the green screw on the switch. Connect all of the whites together with a wire nut, they do not connect to anything else. Connect the two blacks that are in the same box entry together with a black pigtail. The black pigtail connects to one terminal of the single pole switch, it does not matter which terminal. This leaves a single black wire - from the cable in the single entry, it connects to the other terminal on the switch. Carefully fold all of this into the box paying particular attention that the bare ground wire does not touch either of the terminals on the switch. Also being careful not to damage the drywall as you install the switch & wiring. Restore power & pat yourself on the back.
So, you added a switch at another location & some three wire with ground between the two? Is that correct? If so, you are not likely to fit all of this in to the single gang box. This would also invalidate much of the instructions above. Let me know and we can continue.
We can still get this done if you are changing to two 3-ways. We can also wire it so as not to turn off the rest of the circuit. Instead of a single-gang box I recommend that you use a two-gang to have enough room to accommodate all of the cables at this location. In the end, the second gang at this location would have a spare, unused switch. Do you have the 3-wire cable installed from this existing switch location to the location of the other switch?
That's all three whites (neutrals) together at this location. Yes, get to this point with all of the aforementioned instructions then it's simple to wire the 3-wire cable in for the other 3-way switch. Obviously you will need 2 each 3-way switches. Get all of this done and let me know, then we can finish up, thanks. (it's late here, will check for new replies in the morning ).
Again, follow the former instructions (they are in fact valid) then it's simple to add the 3-wire, just get it installed between both switches and we will continue tomorrow, thank you Dan.
Yes tomorrow evening is good, thanks
Dan, just checking in to see how it's going. Let me know when you are ready to continue. Thanks