ST1100 1999 some lights does not work anymore.

[HeinST1100]

Green light ( neutral shift) - citylight - taillight does not work anymore I already checked the fuses but they are all good as also the lightbulbs. I can't find the problem Is there someone who can help me out ?

 

[PmodelinUS]

My Neutral light was on and off working last year. I found the wire for the neutral light under the gas tank had worn through. I fixed it and it's been fine since. I would look for easier issues like a faulty or dirty switch first.

 

[Uncle Phil]

The first thing is to check your earth connections (one up behind the center stand handle) and the other down on the left side bottom of the engine,
and then the cables to the battery.
Taillight/Headlight issues are easier to figure out than neutral light.
There is a neutral switch 'buried' down by the alternator that can be the problem - the terminal gets corroded.
There is also a clutch switch diode 'buried' in the wiring harness up on the left side - usually destroyed if the electrical system suffers a serious dead short.
Also the clutch switch can be an issue.
Any of the three can do strange things to the neutral light.