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I want to add a +1 to what Roy said.The bulb is powered (slowly) through a NTC thermistor. I've never heard of one burning out.The sensor is about 1k ohm normally.Have you had the tank off, and maybe messed the connection?
For sure, the tanks been off a couple of times since I've owned it. Is this sensor a common item that can be easily sourced, if it is burned out, as Roy suggests?
I'd be surprised if the fuel light is burnt out, it gets such an easy life, turns on slowly and never to full brightness.Its more likely to be the thermistor sensor burnt out.
Related....I sure wish I had a tachometer on this bike. I know Speedhut sells a nice single can that fits the mount that has both speedo and tach, but don't know what would be involved in getting proper data to the unit..
couple of 12 hr days have kept me from pulling anything apart. Gonna do a hundred miler Sat, so I'll break into after that, and keep ya'll posted.