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Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
No reading or 0.0V shown
on the display.
Clamps are not making a good
connection.
AC cord and/or extension cord is
loose.
No power at receptacle.
Clamp polarity reversed.
Check for poor connection at battery and
frame. Make sure connecting points are
clean.
Check power cord and extension cord
for loose fitting plug.
Check for open fuse or circuit breaker
supplying AC outlet.
Verify and reverse the battery clamps.
The Boost/Charging LED
does not turn off.
The charger is still in Boost mode.
The charger is still in one of the
charge modes.
This is normal. In Boost mode, the Boost/
Charging LED will not turn off until the
battery is disconnected from the charger.
This is normal. In one of the charge
modes, the Boost/Charging LED will not
turn off until the battery charging process
is completed.
Short or no start cycle when
cranking engine.
Failure to wait 3 minutes (180
seconds) between cranks.
Clamps are not making a good
connection.
AC cord and/or extension cord is
loose.
No power at receptacle.
The charger may be overheated.
Battery may be severely
discharged.
Wait three minutes or until the display
reads
rdy
and the Boost/Charging LED
is on.
Check for poor connection at battery and
frame. Make sure connecting points are
clean.
Check power cord and extension cord
for loose fitting plug.
Check for open fuse or circuit breaker
supplying AC outlet.
The internal thermal protector may have
tripped and needs a little longer to close.
Wait until it automatically resets and try
again.
On a severely discharged battery, use
the Boost rate for 10 to 15 minutes, to
help assist in cranking.
Charger makes a loud buzz. Transformer laminations vibrate.
No problem; this is a normal condition.
Battery % stays low during
charging.
Battery is severely discharged.
Wrong battery voltage selected.
Continue charging battery for two more
hours. If problem continues, have the
battery checked and replace, if necessary.
Make sure Battery Voltage switch is set
to the correct voltage for the battery you
are charging.
The “Maintain” and “Fast
Charge” rates do not work
on the 24V setting.
Complete charge of a 24 Volt
battery is not a function of this
unit.
This charger does not fully charge 24V
batteries. It boosts the voltage to 27.3V
and holds the voltage at this level.