It's the right bulb. The voltage comes from the stator and yes the lights get brighter when you rev it as it should.. A wire came lose under the tank due to the lousy job I did making jumpers. I ordered 4 headlight bulbs and 4 taillights. Again does the taillight bulb go out when the headlight bulb goes? Has anyone had a headlight light bulb go and the tail light stay on? Does anyone have a headlight for this bike? TL, MR, MT, CT there all the same headlight. I need one more. Just registered the bike today and all I need is to get these lights working and I can ride through town on this TL. There's a company in Thiland that has them new for like 40 bucks but I don't want to wait a month for it to show up.