Had a couple of lights not coming on at the ends, and it was just a little corrosion behind the light bulbs. When I had the front lens cover off to work on the bulbs, I seen a 3 position toggle switch right beside the light bar. What or why is that there? Different row configuration... 4,6,8,12?
edit; yep. found the OM. that switch is to change how many rows you are monitoring.