Motorcycle Repair: honda shadow 750, honda shadow 750, stator coil

Question
i have a 2000 Honda shadow 750.  i just purchased a battery less than 6 months ago.  I just removed battery from charger. went out on a ride, about 30 minutes of riding, the bike starting sputtering and it turned off.  i had to pull over. the battery was dead.  not completely dead but i removed seat and had a cop jump start me.  after 3 minutes it died again.  dead battery.  What is causing my battery to go dead so quickly, something is draining it.  I don't know what to do anymore, please help with your advice.

Answer
Hi Luis,

The most likely problem is that your charging
system is not working or your battery has
a faulty or shorted battery cell.

The battery should be load tested at an
auto shop or motorcyle dealer.
This will verify if it is still okay.
It must be fully charged to do a load test.

You can connect a multimeter to the battery
terminals and see if the bike is charging.
Speed the bike up to about 3000 rpm
and see if the battery voltage is about 14 volts
or slightly higher.

If the voltage is only the same as the battery
or under 13 volts then the bike is not charging
properly.

This could be a faulty alternator stator coil
or a faulty regulator/rectifier unit.

The alternator stator connector
is under the seat. It has a white
connector with 3 yellow wires.

Unplug the connector and check the
"AC" voltage between each set of yellow
wires with the bike running fast idle.

Between any two yellow wires you should have
30-60 volts "AC"
Also, none of the yellow wires
should have any connection to ground.
You can check that with the ohms setting
on the meter.

If the stator voltage is low or none
then the stator coil under the
left engine cover will need to
be replaced.

If the voltage is okay on the stator
but not on the battery then
the regulator/rectifier unit is likely
faulty. There is no test, just replace
it if the stator voltage is good and
the battery is good.

To check for a drain just remove your
negative battery cable and put a test
light between the battery and the cable.
If it lights up with the key off, that
is a drain. Pop fuses until it goes off
to find the troubled circuit.

Good luck!
Wayne S.
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