With 40,000 miles on my C90T I started having a headlight problem. When the starter switch was depressed the headlight goes out (normal) but failed to come back ON. If I depressed the switch again (motor now running) it would come back ON. I tried spraying with electronic switch cleaner-lasted about a month. Resolution was to replace the switch. That´s the right side switch, contains the 4-way flasher switch and housing, too.