driving lights don't turn off

A couple of years ago I added a pair of driving lights, wired up so they are on only when my high beams are. Also put in a dashboard switch so I can disable them if I want to. Everything worked great for a while, but now the driving lights never turn off, regardless of position of said switch and regardless of the on/off condition of the headlights. So I had to disconnect the wire going to the lights. Any suggestions as to where to look for the problem?


John

probably water in the relay. They are very sensitive to water.