no headlight..battery not charging By calava (Read 1,525 times)

[calava]

I have a jonway yy250t...my scooter has no headlight, no tail light, no dashboard light...I have taken it to a mechanic he change the stator the voltage regulator n still does not give me a charge n the lights wont turn on...I see he is frustrated as im too...what can it be...let me star by saying before this the battery was giving me a 12.20 v now with the change is giving me a 12.90 v...the mech said it should be 13.5v to charge the battery...still cant find problem after a month on the shop....HELP!!!!!

[richardthescooter2]

Have you check your fuse box? sometimes the fuses look good, but they can be bad. Have you check all your connections, (3 way plug/ 4way plug etc) especially near your R/R. What does the battery read when scoots not running Is it the 12.90? how much when rev up?

[Alleyoop]

Yep , sounds like a fuse problem
Alleyoop

[chihuahuas]

start over, check the 3 yellow wires coming from the stator. do an ohms reading on them there wired like this

the readings should be near the same on all wire combinations.
Check the wires to ground they should read open.
Checks good start engine idle and see if voltage is coming out on all 3 combinations.

Next on to the regulator, Looks like this


inside here what you are looking for is a shorted triac or shorted diode.. You can find it with a multimeter on diode setting. Follow the path and see if there is a shorted triac or shorted bridge rectifier diode.
It is pretty simple.
I suspect he got hold of a bad part. That's what is going on.

if That don't work Yell at the DOg

[Cruiser]

This sounds almost like a classic open blocking diode problem. If this part is bad or the connection is lost, the battery will not charge and you will not have headlights or taillights.
Here's a picture of the diode on my YY250T:



It's the small heat sink device in the upper left hand corner with the black and red wires.

Try disconnecting that white connector and jumper the connector on the harness side. If the headlights come on and normal charging voltage is present at the battery with the engine running, then the diode is no good. If no increase in voltage occurs with the engine running, then you have a charging problem.

[abracy]

Hello. I'm pretty new to this chat stuff so I hope you will bear with me. I have a 2012 yy250T and I am always needing a boost to get it started again after riding an hour or so. I bought a new battery and still the same thing. I tried looking in the forums on how to specifically check to see if the stator is bad but I am not sure on how to perform the steps. (I don't want to short anything else out) I used a multimeter to check the battery and it read 12.4 at idle. when revved to 3000-4000 rpms it read 12.5. AT 4000-6000, it read the same 12.5. Can someone help me out?

[abracy]

P.S I have all my lights and it runs pretty well. I have about 1100 miles on it.

[Alleyoop]

Well it is definitley not charging, So the problem is the Regualtor/Rectifier or the Stator one of the two no 2 ways about it. But you can test the stator to see if it is feeding the R/R enough juice and if it is then you know it's the R/R if not then you will need a new stator.
Alleyoop

[abracy]

Thx for your prompt response. I isolated the problem to the stator. I have 23-24volts on two of the yellow wires. The third has 0.
If I may ask, how/what causes the stator to go bad. My reason for asking is I just bought this bike a little over a year ago. It was towards the end of the summer meaning I did not ride it that much. Didn't ride it at all during the winter. Here it is spring and I am buying a new stator. Is this going to be a regular thing with this bike?

[Alleyoop]

Great good job, yea the stator is bad, Now lets hope it did not ruin the R/R. After you put in the New Stator start it up and put your volt meter on the battery and see if it is charging. Then rev it up a little and see if the voltage goes up.

Many things can cause a STATOR to burn up poles, water gets in there and shorts them out, bad connections causing a lot of resistance and some just were defective to begin with not built and wound good or a nip in one of the wires.
Alleyoop