Battery Not Charging on 2001 50cc Sundiro By sirthomas (Read 783 times)

[sirthomas]

I can put a fully charged battery on the scooter. Put my meter on there and it reads approximately 12.7 volts. I start it up and it drops to 11.5 volts and starts dropping slowly. I saw a video where the meter jumps to 13.1 volts when started with the battery in it.

Where do I start looking. I understand that the Stator either works or don't work. If the stator is bad it would not run. I don't think the CDI has anything to do with the charging of the battery so it must be the rectifier/regulartor correct?

[sirthomas]

I disconnected the 4 wire connector off the rectifier and connected the meter red to the Yellow/Red wire and black to ground, kick started the motor and set the meter to AC. I'm only getting max of .30 AC volts. Can a motor run on that. The battery is not charging up and the headlight is not very bright at all even at high beam with a new bulb. Is this meaning I need a new Stator? Below is the schematic for this scooter.

[alleyoop]

30Vac with motor not running is fine, if your testing the stator output start it and rev it up to about 4k and it should read 50+vac. if so your stator is fine . If it is not charging your battery and the lights are dim 99% of the time its your Regulator/Rectifier that went south.
Alleyoop

[sirthomas]

I guess it's hard to see but the decimal is in front of the 30. Does that still mean it's 30 vac?

[alleyoop]

Testing thiings just using the kickstarter is crapoola it is not good enough, does not spin the turn the crank enough to produce much of anything. Start the the motor then test the wires from the stator. Also what colors are the stator wires that plug into the R/R? Not the two wires that go to the CDI(which one is the pickup coil wire and the other is the CDI power wire).

[sirthomas]

The wires connected to the Rectifier are White/Brown (to stator), Yellow/Red (to stator), Red/Blue (to the fuse) and Black (Common).
It starts up and runs when I kick start. The .30 is when I rev it up with the meter's red lead connected to the Y/R wire and the black to a ground. Looking at the manual, I may have the meter set up wrong. I'll have to try it again later. It's 5:30 am. I'm not a late sleeper.
The reason I'm checking this is, as I have mentioned, the battery is not charging. With the meter set to DC and the red lead on the positive and the black to the negative and the motor running, the battery fully charged, the meter reads in the upper 11's and starts dropping slowly. Also taking the scooter out at night, you cannot see ahead at all with a new bulb and high beam on. Now I get conflicting information. One says the headlight gets AC voltage and the other says DC voltage. If it is AC then the Stator is not producing enough voltage. This scooter does not have a "headlight switch", just the dimmer switch. The bulb is a 12V 35W/35W.

[sirthomas]

My mistake. I was reading the meter wrong but 30 vac at 4000+ rpm is the most I can get. At idle (wheels not turning) on it's stand it's about 11 vac. Is that enough? Should I go with the rectifier or Stator?

[superdavepcb]

Swap out the rect 1st, see if that doesn't solve it. Swapping out the stator requires a special tool to remove the flywheel and is a more expensive part.

[sirthomas]

While waiting for the rectifier to come in I thought I'd check the air cleaner. Whoa! It's all crumbly. I had to order another one so I pulled the carb apart to make sure it's ok. Looks good. The gasket to the crankcase cover (that covers the belt drive) is all rotted but the belt looks ok. I've got to make a new gasket. Sure I cut my own on everything I work on.
I decided I'm going to rebuild from the ground up since it appears that the previous owner didn't take care of it. I'm waiting for the flywheel puller to make sure there is no rust on the stator. If there is, I'll clean and check it. There is an oil reservoir on the wheel end of the belt drive with no oil.