I’m new to home improvement, so I pretty much limit myself to replacing existing electrical problems. I am pretty stumped on this two-toggle switch in the kitchen if my early ‘70s house. One switch activated the over sink light, the other an under sink outlet for the garbage disposal. (not sure which one is which, as neither is functional at this time). I thought it would be pretty straightforward process, to replace the two switches, but when I pulled them from box there was an extra wire I could not determine how it had been connected. Two black wires were connected to the toggle switch on the left and a black and white wire were connected to the toggle on the right. Then there was a confusing extra black wire on the right side extending from a twist connector (unconnected now and not sure where originally attached). Any ideas, where that one may go?