Why does my rear light keep blowing the bulb?

[Lennie]

I dont know why my 04 Wr450 keeps blowing the bulb in the rear light, the tail light bulb lasts about one - two hours and the brake light lasts about five hours then blows.

Is there something that I can check like places where the wires are well known to get damaged? How much power should I be getting to the rear light?

I ride on the roads, dirt and supermoto so need a rear light to be legal !!! Changing the bulb every hour is crap !!! Help please. ?

[doctorchopper]

My bulbs are blowing regularly as well, it turns out my voltage regulator/rectifier is toast. There should be around 12 volt ac, but with the revs up i was getting up to 24 v ac.

[William1]

Could also be vibration or a bad ground. These are common causes of blown bulbs on a AC system.

[Lennie]

I had a new voltage regulator / rectifier not too long ago and this didnt solve the problem. Also the headlight has had the same bulb in for over a year.

[William1]

Check the ground connect for the tail light. As I said ealier, it could well be a vibration issue. A change to a LED replacement may be the cure assuming the ground is good.

[doctorchopper]

With it being an AC system will it be grounded?

[doctorchopper]

Just looked at the wiring diagram and yes it does go to ground.The wire Marked B, so i'd say black or brown