Electrical Charging Problem By kountryguy (Read 619 times)

[kountryguy]

I have a Roketa MC-70-150 with about 600 miles. It has been starting fine. This AM, no start. I kick started with no problem. Seemed like a dead battery. Drove it 10 miles, let it sit 3 hours, it started with the key. Drove 1 mile, shut it off for 15 min., had to kick start it. Drove home 10 miles, shut it off, tried to start, no good. I let it sit for 2 hours, checked the voltage, it read 10.32v. I kick started it, got it running, checked voltage, 13.6 volts at medium throttle. That shows that it is charging. I removed the battery and replaced it with a fully charged battery from my other scoot. It started right up. I checked the voltage while it was idleing, about 13v, revved it up a little and the voltage climbed to 15 volts after about 30 seconds. Is that too high? Seems to me like it is cooking the battery. What should I check? Maybe the regulator. How do I check that? Thanks for any help. I hope the warranty may cover it.

[Bashan]

You did check the regulator, if it got up to 15+v that's too high and it's the regulator that controls that. Rich

[sprocket]

As I said on the other board 14 to 14.5V is optional. I have frequently seen scooters with 14.9 volts and it isn't a problem. If you battery is getting warm to the touch you can either change the regulator/rectifier or put a load into the DC system which will reduce the voltage...a 35W light bulb should drop it to around 14.2 volts...

On some older scooters there is ballast resistor that does this exact thing.. perhaps yours has one and it has gone bad...I don't know...