GP100 Lights problem

[FretGrinder]

So I'm coming home froma mates house tonight and I hit an NSL road and give it the beans, get the bike up to 65 at about 9.5k rpms. When I get close to the roundabout I put the indicator on and it's not working and my headlight is really dim. I put it on main beam and it's still dim. I Get home and the indicators won't work on idle but if you give it say 3k revs they just stay solid and the headlight gets a little brighter. Indicators won't work on idle.

I think it's a blown fuse or something, anyone got any ideas?
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Yamaha MT-09

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[Howling TerrorOutOfOffice]

Sounds like there isn't enough power in the battery.
Also sounds obvious, but are all the indicator bulbs are ok? A blown bulb doesn't actuate the relay.
As the headlight get abit brighter when you rev then the battery is getting some charge, so the regulator/rectifier is probably ok.
A multimeter will answer most of your questions.

I suspect a knackered battery. (Is it over 5yrs old? Do you check the levels in the battery cells)

Pat
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[FretGrinder]

Hi pat,

I've just popped a new fuse in and it seems to be back to normal apart from the main headlight bulb looks like it's blown but strangely the main beam light in the rev counter has also gone, weird. I'll give it a go over will a multimeter tomorrow, check all the connections and check the voltage on the battery.

When I got the bike it had been stood for a over 10 years all the lights worked at the time. The indicators are dim as hell when it idles and get bright and almost solid when I give it revs. Maybe these two problems are related.

It thought it was weird why it's only blown the fuse tonight. There was almost no traffic about so I thought I'd open it up. I dunno if the fuse blew and then the bike was getting all the power from the generator?

Like I said i'll check it out tomorrow and see what else I can find.

Cheers
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Yamaha MT-09

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[cb1rocket]

Bike is 6v electrics and uses direct lighting for the headlight and rear light. Brake indicators and horn all run off the battery.

no regulator on these, just a ballast resistor to prevent battery over charge.

I suspect alot of corrosion on the loom from a bike thats nearly 30 years old. Clean the contact and go from there.

It might be worth checking the generator is giving out the correct juice. w

[FretGrinder]

OK, I think ites completely sorted now. The fuse that came out of the bike was a small green piece of plastic with a wire on it but no indication of what amperage it was. It's been replaced with a 10 amp fuse and all is well. I cleaned the contacts on the fuse holder as the voltage was all over the place and now I get proper function on all electrics. When the fuse blew it took out the main headlight bulb. At a guess I'd say there was a 5 amp fuse in there but it needs to be a 10 according to the haynes manual.

Is this what caused my headlight to die?
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Yamaha MT-09

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[cb1rocket]

under amperage fuse is possible - also over revving can cause the generator to over power the bulbs and blow them, so avoid false neutrals!

[FretGrinder]

[cb1rocket]

Trying to get a good quality 6v headlight bulb is a must, they can blow quite easily. And have a good battery on the bike, despite the fact it doesnt really need one! It just helps to dampen the charging system and prevent bulbs blowing