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mightbesane



Joined: 05 Sep 2008
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Location: Pennsylvania, USA/Languedoc, France

PostPosted: Tue Nov 17, 2009 4:50 am    Post subject: Voltage Regulator??? Reply with quote

Well, the first head scratcher on my trusty scoot after 11,000 km.

While riding home in the dark, when I left the lights of town I realized that I had no headlight. Hurried home and took a look. The headlight and the little running light below it were glowing cherry red but not lighting up. So I picked up a new headlight and fitted it. Same thing. Called my mechanic buddy and he came over and determined that the control switch was bad. Ordered one from eBay. Not quite plug-and-play, but after matching up the wires from the old to the new we made the headlight work but not the little running light below it or the running tail light - which we realized was not working either. Brake light worked, though. Fooled around with a multimeter a bit - not me, I'm a complete clod when it comes to electrics. Finally, my buddy unplugged the voltage regulator and all lights worked.

Does that mean replacing the voltage regulator is the solution? What should the multimeter read at pins on the voltage regulator when the scoot is fired up?

I HATE ELECTRICS! Evil or Very Mad



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DaveS



Joined: 14 Jun 2008
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Location: Bavaria, Germany

PostPosted: Tue Nov 17, 2009 9:25 am    Post subject: Re: Voltage Regulator??? Reply with quote

mightbesane wrote:

Does that mean replacing the voltage regulator is the solution? What should the multimeter read at pins on the voltage regulator when the scoot is fired up?


jpmacd733 has made a whole thread on the charging circuit here:
http://chinesescoots.forumwise.com/chinesescoots-thread6382-0-asc-0.html


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NOLA Scott



Joined: 16 Apr 2009
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Location: NOLA, baby!

PostPosted: Tue Nov 17, 2009 1:41 pm    Post subject: Reply with quote

Quote:
Does that mean replacing the voltage regulator is the solution? What should the multimeter read at pins on the voltage regulator when the scoot is fired up?


Better yet, check the voltage at the bulb socket with/without the regulator. If with the regulator it is less than the rating of the bulb (what? 12v, something something amps?), then the regulator is not doing what it should and is likely bad.

Speaking of which, I have to go replace a rectifier on a brewer today. Silly manufacturer put them and the transformers directly under the deck the brewing urns sit on. One overbrewed batch of coffee and the danged things get wet. Thanks for reminding me. Rolling Eyes



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threedogs61



Joined: 28 May 2008
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Location: North Brook, North Carolina, USA

PostPosted: Wed Nov 18, 2009 12:56 am    Post subject: Re: Voltage Regulator??? Reply with quote

DaveS wrote:
mightbesane wrote:

Does that mean replacing the voltage regulator is the solution? What should the multimeter read at pins on the voltage regulator when the scoot is fired up?


jpmacd733 has made a whole thread on the charging circuit here:
http://chinesescoots.forumwise.com/chinesescoots-thread6382-0-asc-0.html


Joe knows his stuff.

Just wondering if you might have a short somewhere since you were able to get the lights working again.



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mightbesane



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PostPosted: Wed Nov 18, 2009 3:41 am    Post subject: Reply with quote

That's our next move if the regulator doesn't do it...trace our way through the harness.



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1fixitman



Joined: 19 Jun 2008
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PostPosted: Wed Nov 18, 2009 4:51 am    Post subject: Reply with quote

Sounds like what is happening is that the AC voltage coming in to the regulator is being shorted to ground directly instead of it being regulated to the 12-15 AC volts like normal. The yellow wire provides the AC voltage for the lights. The current flow thru the lights is based on the voltage at the light and the resistance of the individual light.
current equals voltage divided by resistance or I=V/R
The brake light was coming on when you pulled the brake handle because it comes off of the DC from the battery.
The Red wire on the voltage regulator goes to the battery and should maintain the voltage at or close to 14.3 volts DC. When voltage gets too high(greater than 14.3 Volts DC) the voltage regulator shorts some of the voltage to ground until it is back down to the 14.3 normal voltage. You can not control the voltage coming into the circuit as that comes from the stator. The voltage coming in is based on the speed of the engine, the integrity of the magnets inside the magneto/flywheel and the condition of the wires coiled around the stator core.
Back to the brake light....Here is a little something that most people don't get......There are two filaments or lights inside of the brake light. One of those filaments are powered by the yellow wire(12 volts AC regulated by the voltage regulator) which is the filament that provides the running light while the scoot is running. The other filament or light has 12 volts DC from the battery when the brake handle is pulled(micro switch is actuated and a set of contacts inside that switch are touched together). The ground for the brake light is common(go to the frame of the scoot) but the two filaments get signals from two entirely different circuits on the scoot.
I hope this helps you get the details down to find your problem.
I hope you did not rev your scoot too much while the voltage regulator was unplugged or you provided very high AC voltage to a bunch of lights........if it was then you probably have blown lamps at the fuel gauge, speedo, running lamp portion of your brake light and possibly your license plate light if you have one.



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