Tinalan, That switch is to activate the on board fresh water system on some smaller boats. SR used a universal switch pad. As your fresh water switch is down in the cabin, it is an extra. If you are electrically savvy, the switch will activate a breaker in the ECM under the dash. I believe it will carry 10 or 15 amps. I found there was a capped off wire coming from the harness out of the ECM that it actuated. I found which breaker / fuse it was by taking the cover off the ECM and doing a trial and error. As I had already used my forward and Acc 1 for other components - I used this one for my Autopilot. Hope this helps.