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Last Updated: June 17, 2011

Half Wave Stator to Full wave

We all know that small bikes charging system is made up of only a Half wave ac to dc conversion thus making it impossible for the system to give enough juice out from the stator to charge batteries at low rpm...To compensate for a FULL WAVE rectifier be installed on this system, we need to do some modifying to the stator,

the picture shown uses the stock configuration of a Half Wave system with an AC lighting coil present for headlight connection center tapped to the whole winding of the stator. One end of the coil is connected to chassis ground. I order for this system to give way for a FULL WAVE rectifier, the grounding system must be omitted and center tapped connection for headlight must be removed as shown on the next picture below.

the headlight will be redirected to the battery by cutting the yellow line of the AC lighting coil from the Stock regulator/rectifier, so that the headlight ON off switch as well as the HI/LOW system will still be used without any rewiring that headlight path.

ADVANTAGES of this system than the latter.

with full wave regulation you have almost twice usable dc power (and cleaner) than with half wave
last , cleaner regulation with the sens wire, if well used, it deliver more power if their is a drop (big consumption) than the other fixed simplier one where lighting often drop
and better protection for you electronic again drop or over charge


estregan said...

Hi, I have converted my Vespa PX150 using something similar to your post from stella speed forums here:

I'd like to know if you're using a full wave rectifier for this or you're using a stock regulator/rectifier. If so, which rectifier would you recommend?


LEI said...

hi estregan, if you convert your half wave stator to full wave you cannot use the stock regulator because one end of the stator winding is grounded to need to isolate that ground by removing it internally then conevrting it as one of your terminal, so you'll be having two AC terminal rather than just one with half coil will be omitted, this is the center tap of the winding...

estregan said...

LEI, is there an aftermarket rectifier/regulator that you can suggest? Or perhaps you have a diagram of a diy version that I can try making.

LEI said...

Estregan, full wave regulator can be found on 150cc GY6 engine...dink, joyride, or any other 150cc scooter uses full wave if you buy a regulator...ask for those mentioned above...

again you need to determine is if your stator is grounded to the engine block or not.

Ruden Lumegas said...

What color of wire grounded in atouch to engine block

Michael Ramos said...

hi, i would like to know what type of full wave regulator will be suited to my xrm125 motard(2013). i am planning of converting my stator to full wave.. thanks ahead.. god bless!

Jade Luna said...

Hi I know this post is a bit old, but would like to try anyway.
I plan to fullwave my stator but my question is, is there really a need to put the lighting (headlight and stuff) rewired/connected to battery after doing fullwave to stator?

If I am not to rewire the lighting to the battery and only worked on the stator and changed the regulator to fullwave what would likely to happen?

thanks in advance.

Nathaniel Berdan said...

Jade Luna

if you will not re route your headlight to the battery path then you will have no HEADLIGHT, you simply cannot tap anything on the stator AC winding since it was already disconnected to ground and one of your Bulb terminals is always connected to Ground. You are just messing with the FULL WAVE system.

If u want more answers, Just differentiate both system. There are many articles about AC regulations.