voltage fluctuates 15v no lights on, 9volts with lights on?

hensim · 07-15-2010, 01:46 AM

Scoot is a typical china gy6 150cc, and it is around a year old but only under 100 miles on it. However the battery did sit without a tender most all that time. Is this likely a bad battery, even though it alone reads 12v or so when the scoot isn't running? Or should I be replacing or testing the voltage regulator?

I'm just going off what the voltage meter on the dash says. Maybe they suck?

When I flip the ignition on it's 12v before I start the engine. Seems to me even if the battery were bad the voltage regulator should be doing a better job, no?

Cal25 · 07-15-2010, 09:05 AM

I would take a seperate reading at the battery with a volt meter. Does the voltage with the light on stay the same regardless of RPM?

07-15-2010, 01:46 AM	#1
hensim Join Date: May 2009 Posts: 42	voltage fluctuates 15v no lights on, 9volts with lights on? Scoot is a typical china gy6 150cc, and it is around a year old but only under 100 miles on it. However the battery did sit without a tender most all that time. Is this likely a bad battery, even though it alone reads 12v or so when the scoot isn't running? Or should I be replacing or testing the voltage regulator? I'm just going off what the voltage meter on the dash says. Maybe they suck? When I flip the ignition on it's 12v before I start the engine. Seems to me even if the battery were bad the voltage regulator should be doing a better job, no?
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07-15-2010, 09:05 AM	#2
Cal25 Join Date: Feb 2008 Location: Terrell and Grapevine Tx. Posts: 1,585	I would take a seperate reading at the battery with a volt meter. Does the voltage with the light on stay the same regardless of RPM?
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