How to replace wall switch to garbage disposal also connected to dishwasher.

Gary's Avatar (by Gravatar) by Gary in  Energy » Electrical 

I've already replaced the switch. There are 3 black wires & a ground coming out of the box in the wall. I have it wired but the disposal doesn't turn on when switched. The dishwasher runs. If I switch 2 of the black wires, the disposal is on all the time and the dishwasher does not run.

What am I doing wrong?

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