Did you actually look for the switch on one of the driving lamp housings? Yamaha uses a very small switch for this application and it may be easy to overlook, especially since they mount it at the bottom, inside of the housing. I have owned Silverado's since 1999 and every one with Yamaha factory installed, or dealer installed driving lights had the switch where I mentioned above. If yours isn't there, you may have someone's homegrown switch installation, located in that "secret" place. Good luck!