I have had the headlight combination switch, part number NC11-66-122 fail in this Mazda miata 6 times. After the first replacement I noticed all the subsequent failures were due to a mechanical failure in the switch and not an electrical problem causing the failure. When the switch fails, I turn it to either parking lights or headlight position and the lights will not come on unless I physically continue turning the switch past it's "on" position. Soon as I release the switch and it falls back into the "on" position, the lights go off. The first 4 replacements were performed by Mazda dealers under warranty. Of course, they do not try to figure out the cause of the failure, they merely replace it. The fifth replacement I was able to keep the defective part and I disassemble it and found the contacts were not touching unless the switch was turned past the "on". I am now in the process of having the 6th combination switch replaced. On this present failure I can also physically push the switch inward and the lights momentarily come on then turn off when I release the inward pressure. My assessment of the problem is a poorly manufactured switch. It is definitely a safety hazard should the switch fail at night. Failure date mileage serviced by 02-25-2008 13737 Mazda of longmont 05-26-2009 23744 spradley barr Mazda 01-18-2010 29206 spradley barr Mazda 06-01 2010 35084 spradley barr Mazda 10-25-2012 58656 coyote motors 03-??-2015 72300 part on order by courtesy Mazda, longmont

- Longmont, CO, USA