On/Off switch on dash

Use the KISS approach, do nothing, next sometime something doesn't work throw the s/w and see what happens.

Does it look like the other switches? If not as mentioned above could be anything. In a 2000 Hurricane I once owned the wipers would not turn off. This was after having the motor repaired. To solve the problem I simply installed a switch on the dash the killed the power to the motor.

If it is not a factory installed switch it could be virtually anything. A pair of fog lamps that are no longer there? A rear work light? etc. About the only solution is to get under the dash and try to trace where the wires go.

Our 2001 Georgie Boy Landau has a switch on the right of the glove box that operates the right side overhead map light. The left side map light is operated by turning the dashboard light brightness control all the way up until it clicks. The lamps themselves may also have built-in switches, so make sure they're on as well.