difference between two wiring methods for rectifier / regulator

Hi guys,
I'm wiring up a new 12v charger ignition system into my 1976 RD400 motorcycle and the wiring diagram that came with the r/r has 1 wire from the charge coil hooked up to two of the wires on the unit while the other end goes to ground.Most diagrams I see have both ends of the charge coil go to the r/r and the other two coming out are simply the pos and neg 12v.What is the difference between these two methods?Thank you,John

Hi John,
There's no real difference between the 2 methods, it's basically the same wiring done in different ways. The only difference would be in the components used in the rectifier regulator.The transistor in one is different to the other. Why they choose the different components? That would be a question for their design engineers but may simply come down to newer components coming on the market. Especially if it's an older bike/ diagram.
Regards

Sorry you lost me when you  said "The transistor in one is different to the other. Why they choose the different components? "Its a brand new ignition system I purchased from here https://www.treatland.tv/HPI-regulator-rectifier-p/hpi-regulator-rect-210v261.htm  and this is the coil ignition system I will be running  https://www.treatland.tv/HPI-CDI-mini-rotor-ignition-system-yamaha-RD350-p/hpi-yamaha-rd350-mini-rotor.htmIt has a 60w lighting coil.
There is a comment in the customer feedback section for the r/r where he says "This is a half wave rectifier that will produce only 5-6 vdc when wired for battery charging and other DC-only loads."I dont understand what this guy means either.... what does that mean? Thank you for the help! Its really appreciated.

ok, I just looked up the difference between half and full wave rectifiers. 
If I understood what I read then I can not understand why they would even sell a half wave rectifier for a lighting coil for a motorcycle. Is half the power literally disregarded and only the upper part of the wave is used?

Yep, you got it. With half wave nly one half is used.

You also don't necessarily need the full wave rectified. Plus the components would be cheaper to buy to only rectify half the wave. Sadly most of the time it's all about cost savings.

I'm so confused!
I don't understand why half wave rectifier/regulators would be used for a motorcycle like mine that has a 12v battery in it. Does half the wave not being used mean half the potential power is being lost as well?For example... the lighting coil is rated as 60w. Does this mean with half wave I will only see 30w?

On your bike the generator/magneto or alternator will be producing an AC voltage while running.
The AC voltage produced by each bike manufacture/ type is similar but would be roughly 14-15 volts AC at idle.  As you increase rpm that voltage rises up to say 25volts AC. Some bikes will be different( I'm only including values to illustrate my point).If we assume for the moment that your bike produces 15volts AC at idle then this voltage if viewed as a waveform would have two voltage peaks, a positive and a negative peak. You would see a positive 15volts and a negative 15volts because it is an AC wave. The AC voltage is then fed into the rectifier circuit which is used to change it to a DC voltage. Now when changing it to a DC "wave " we can simple not rectify the negative half and only rectify the positive half. This now gives us a zero point or earth and a positive 15vDC. The rectifier would most likely also limit this output voltage to something around 13.5 to 14.5 volts DC because this is a better voltage to charge your battery and not damage it or the components on your bike.This does mean that yes half of the AC voltage is effectively waisted, but that doesn't mean that you only see 30watts instead of 60watts. You will get all the power that you need from the DC voltage from the rectifier. The "lost" power is not really lost, you could potentially rectify the other half of the AC voltage using full wave rectification but in the case of a motobike this isnt neccessary. You get all the power that you need from half wave rectification. Hope that made it a little clearer.

Thanks everyone... I think it's starting to make sense.
Is it better to look at each part of the wave as a potential to make power and that just using the top half is sufficient to provide the power demands of the lights on the bike? 

Yes I suppose you could look at it that way. 

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