My kids Power Wheels has not been charging correctly lately. So I put
my meter on the power supply charger leads and only read 10.6V.
Should it be reading more than 12V since it is charging a 12V
I checked the power supply with no load. Does the output voltage jump
up if it was connected to the battery?
Power Wheels come in both 6v and 12v versions. They use different plugs
and jacks. If you are sure that you have the 12v version then the charger
should put out more than 12v., even when unloaded
Perhaps the charger isn't using a bridge rectifier and only putting out
a half wave DC. Check the voltage at the battery when the charger is
connected. Of course, if you had an oscilloscope you would know
immediately by checking the output of the charger. Oh yea, do you have
an analog or digital meter?
If you have a power supply that doesn't put out clean DC, you'll
actually get a reading on the AC scale of the meter too. If you can get
to the battery terminals while the charger is connected, what sort of
reading do you get there? Most chargers for lead acid batteries of the
type I've seen in electric scooters for kids will put out around 14
volts when the battery is close to full charge. A wall wart power supply
that puts out unregulated 12 VDC for charging batteries or as a power
supply usually puts out 16-18 volts DC with no load and it's large and
heavy. The regulated switching power supplies that you're more likely to
see these days are smaller and very light compared to older style
unregulated supplies. If your charger is fairly lightweight, it could be
a switching supply and defective if it's only putting out a voltage
lower than the voltage printed on it. When you have a good switching
power supply, the output voltage is usually exactly that indicated by
the label whether it's under load or not within the current rating.
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