I have a an older light switch that controls a garbage disposal and a wine refrigerator. I want to change the switch to a newer one but the new switch will not allow me to tie in all 3 black (positive) wires. All of the white (neutral wires) are tied together and capped. How can I install a new switch here with 3 positive wires?

I don't understand why you want the refrigerator to to turn on and off with the garbage disposal, but be that as it may...

If you are having trouble connecting two or more black leads to a common terminal on the switch you could connect a short 4 or 5-inch piece of wire to the switch and then conect the other end to the other black wires using a wire nut.

Boy, I'm confused! So when you turn on the disposal the wine cooler comes on too? Do you mean the refrigerator is through wired and the disposal is run by the switch? Please clarify, I like my wines cold.

Kind of puzzling Heh?

Some photos would be helpful if possible.