Thanks eplourde. I have a 1999 2530 DV EC. The switch setup is slightly different, especially with all of the aftermarket accessories, but it does help.
My main sink switch is the 2nd from the bottom on the dash panel. The sink itself has a regular faucet with a Sureflow motor with pressure valve. There is no additional switch.
If the toggle switch you are talking about is a momentary on/off, it is probably the horn. The one on mine is a momentary on/off push button switch.