About to loose my mind, please help By daven68 (Read 452 times)

[daven68]

Hi guys,
I had to put the bike on ice since last summer but here I am again with the same issue (not charging) I had in this thread.
thescooterprofessor.proboards.com/thread/3202/jonway-yy250t-charging

Last year I had taken the bike to the guy I got it from for this issue and he royally screwed me. charged me 300$ for a stater (i do have the old one) and regulator and gave it back to me after having it for 2 months and said it was fixed and a few days later it died.
tried to do what i could with the help I got from the other thread myself but no luck and also I have limited tools and I am disabled which really limits the amount of bending and stooping I can do. So I saved up some money and found a new mechanic that seemed to know what he was doing, at least more honest than the other guy.
This new guy had it for 3 days and told me that the original guy charged me for a regulator but never installed it so he got me a new one (I have the old one this time and could tell by looking at it that it was way old) , installed it and brought it back to me. Same damn problem, battery quickly died.
So i put a multimeter on the battery and got 12.6 at idle. Cranked up the rpm`s and actually got a drop in voltage down to 12.09 .
I am really stumped now. called the new guy and he is going to come get it and give it another go.

My question is what on earth could be wrong with this thing??? please keep in mind I have limited knowledge on this subject and wiring diagrams look like Chinese to me. What im looking for are a few suggestions that I can give as to where he should start trouble shooting next.

I am really starting to believe that there is not one person in western North Carolina that know how to fix these things.

thanks,
dave

[alleyoop]

First thing you want to do is check the STATOR make sure it is putting out enough to the R/R. If the stator is good then you have to check the Wire at the R/R that goes to the battery to charge it. If it is putting out then you have a bad battery that will not take a charge. Just checking the battery alone is not good enough the meter is just registering the surface charge but as soon as a load is put on it the voltage starts to drop.
Alleyoop

[ellpee]

To elaborate on Alley's post (and assuming certain things because you say you have a YY250T): To check the stator you need to take off some plastics and find a plug going TO the regulator that has three yellow wires along with some others. Those three yellow wires come from the stator. With engine running, you need to test those three wires for AC, I say again AC, voltage, each one against the others. In other words, if we call them A, B, and C, you need to test A<-->B, A<-->C, and B<-->C. You want to see more or less equal AC voltage readings in each case, and you should see a rise in the reading as you increase RPM. On my scooter, a Roketa but basically the same as yours, I get around 20-25v at idle, somewhere up in the area of 70v at higher RPM. I'm told the numbers can vary and run up into the low 100's, but in any case equal in all three cases and higher as RPM increases is what you want to see.

If that checks okay then the stator is sending the necessary "juice" to the regulator, and your problem is somewhere upstream of that -- (regulator, probably not since you installed a new one), blocking diode, or, as Alley says, maybe just a faulty battery that won't take and hold a charge.

[daven68]

Thanks guys,

Update , I put the battery on a tender and it charged up to 100% , I did not trust it and took it to have it load tested and it came back BAD. now I`m wondering if this is the reason for the low readings at the battery that i`m getting. I will get a new battery tomorrow and see what i get for readings then . Hopefully this is the trouble , if not I will continue trouble shooting as per your suggestions.
Thanks again