Endless Electrical Problems On Speedfight 2 :/

[bmunro21]

Hello guys, ive been helping my son fix up a moped he bought off of one of his friends and all is good apart from lights. The headlights and brake lights do work however they are very very dim. The bulb brightness increases if the bike is revved but as soon as it is left to idle the light is virtually non-existent. I don't think that its a problem with the battery as it has been sitting in the garden since sunday now as has only been started a couple of times and it still starts first time with electric start.

Help would be appreciated

[mudcow007]

What voltages are you getting at the battery with the bike off an voltage with the bike running?

[bmunro21]

Im not sure because I don't have access to a multimeter :/

[Islander]

[Polarbear]

Yes, get a multimeter. You dont need anything fancy, just volts and ohms. Will save you (and us) a lot of time fault finding.
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Triumph Trophy Launch Edition

[Rogerborg]

Under £5 from eBay or Amazon.

Or you can start randomly replacing parts that will cost you a lot, lot more.

How's the electrolyte level in the battery cells? Free to check, pennies to sort with distilled water.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[bmunro21]

[Polarbear]

That sounds tickety boo! What's the voltage when you put your lights on.
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Triumph Trophy Launch Edition

[mudcow007]

[bmunro21]

With the bike running and lights on im getting around 13.5, although it did just notice when i started the bike up this time the idle voltage was around 12.8/13v. Think i was revving the bike when i was getting 14v

[bmunro21]

Unfortunately ive gone out now so ill have to check headlight voltage tomorrow

[Polarbear]

TBH for a small bike that all looks OK.
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Triumph Trophy Launch Edition

[bmunro21]

I have been doing alot of reading and from what I can find the problem could be the regulator/rectifier. But then ive read conflicting information that suggests the headlights are not connected to the battery and are instead connected to the alternator. I have found a video on youtube of the problem that I am having aswell if that helps?

https://www.youtube.com/watch?v=wSfINuYX0vM

[bmunro21]

Okay so i've done a bit more reading and found out that the headlight and brake lights are most probably run off of the stator/alternator. So does this mean I need a new one?

[chris-red]

I wouldn't have thought so, as it is charging the battery.
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[bmunro21]

So what do you guys reckon the problem could be?
Im very eager to sort this as my son has spent so much sorting out his CBT, Insurance etc and this is the only thing that stopping him from being on the road now

[bmunro21]

bump?

[lukamon]

bad earth maybe? trace the negative battery leads to where it screws to the frame, unbolt, emery cloth the contact patch, reattatch? do the same at the headlight earth point
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[Polarbear]

Anyone got a wiring diagram for this because if the battery is charging OK I can't see a reason to have the lights running direct off the alternator which is what it sounds like it is doing.
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Triumph Trophy Launch Edition

[bmunro21]

That would be a great help