Put a voltmeter over the battery with the lights on - shouldn't be showing more than 14.2v
1996 TRX 850, blue, Ohlins 46HRCLS, Race Tech Gold Valves, 0.90 springs, Venom pipes, R6 brakes............
1974 Yamaha RD250A, Candy Blue
1998 Yamaha SZR660, blue of course
1967 Yamaha TD1C 250, Blue and white
The holder seems fine and nothing seems out of place no other bulb seems to blow. Losing one tail light is annoying, will pull the tail off this afternoon...