Schumacher SE-1-12S Owner's Manual page 20

PROBLEM
Charger makes a
loud buzz or hum.
POWER ON (green)
LED is not lit.
Charger will not turn
on when properly
connected.
The battery is
connected and the
charger is on, but is
not charging.
POSSIBLE CAUSE
Transformer
laminations vibrate
(buzz).
Shorted Diode
Assembly or Output
Rectifier Assembly
(hum).
AC outlet is dead.
Poor electrical
connection.
Charger is not
plugged in.
Ring terminals are
not making a good
connection to the
battery.
Connections are
reversed.
Battery is defective
(will not accept a
charge).
• 15 •
REASON/SOLUTION
No problem, this is a
normal condition.
Have charger
checked by a qualified
technician.
Check for open fuse
or circuit breaker
supplying AC outlet.
Check power cord
and extension cord for
loose fitting plug.
Plug the charger into
an AC outlet.
Check for poor
connection to battery
and frame. Make sure
connection points are
clean.
Unplug the charger
and reverse the
battery connections.
Have battery
checked.