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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Neutral light and the diode
Post Info TOPIC: Neutral light and the diode
mossproof


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Neutral light and the diode
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Had a new issue this weekend that I've not come across before. Thought I'd share it:

For some time now, my neutral light has glowed dimly  whatever gear I was in, in wet weather. Came on brightly in neutral as normal. I just assumed it was damp causing a mild short across the neutral switch which is frequently covered in mud, with the added factor of my warning light being a green led. I went out this weekend in heavy rain and it was glowing as usual, then about 10 miles in, I noticed the led glowing brightly every time I pulled in the clutch. No problems with starting the bike in gear or in neutral, just annoying.

I got home and started pulling things apart, starting at the front checking the clutch switch for correct operation and no shorts to earth. Disconnected the neutral switch wire and the problem persisted - not a muddy switch then! I eventually got to the diode (funny little cuboid thingy under the seat/left hand side panel, which is part of the engine start inhibitor system) unwrapped it's "waterproof" tape wrapping to find mud, water and general grot all round the connector. Cleaned it all off and dried it out. No glow from the light when in gear. Result. Wish I'd done this years ago! But the led still flashes on with the clutch pulled. Put the diode from my other bike on and bingo, it all works properly again. So my diode had blown. Never had that before. You live and learn.  



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TTRfan


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Is that the diode that doesn't allow the lights until the engine is running?

If so, I discovered it for the first time as I did my last-minute checks before taking a bike to MOT. Much cursing and pulling apart involved until I understood what was going on!

Brian



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mossproof


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Don't know if it affects the lights as well Brian - I thought it was just part of the starter inhibiter circuit linking neutral switch, sidestand switch, clutch switch and engine-off rocker switch. Located under seat, left side, above the airbox cover. Haven't noticed another - is that a Y2k bluey thing? Lights on with ignition on on my OEs, engine running or not.

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TTRfan


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It is a rare thing hence me not knowing about it until too late Simon!
I think it may have been on a Raid. Not sure how I can check after all these years cry



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TTRfan


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I was on the wrong track Simon!

I was thinking of the relay (which is actually a very good idea) that only switches the headlight on when the engine is running and saves accidentally flattening the battery when accidentally leaving the ignition switched on with the engine stopped.

This relay was only fitted to the 4RR2 and 4WA1 (Raid) models. Part number 4WA-81950-00.

See https://ttr250.activeboard.com/t44099757/headlight-relay-anyone-tried-fitting-one/



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