Schumacher AUTOMATIC BATTERY CHARGER XC75 - Manual (Page 12)

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PROBLEM POSSIBLE CAUSE SOLUTION
The charger is making
an audible clicking sound
(continued).
Severely discharged battery,
but otherwise it is a good
battery.
Reverse connections at
battery.
The battery may not want to
accept a charge due to a run-
down state. Allow charging to
continue until battery has a
chance to recover sufficiently
to take a charge. If more than
20 minutes, stop charging
and have the battery
checked.
Shut the charger off and
correct the lead connections.
Charger makes a loud buzz
or hum.
Transformer laminations
vibrate (buzz).
Shorted Diode Assembly or
Output Rectifier Assembly
(hum).
No problem, this is a normal
condition.
Have charger checked by a
qualified technician.
Short or no start cycle when
cranking engine.
Drawing more than the
engine start rate.
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.
Crank time varies with the
amount of current drawn. If
cranking draws more than the
engine start rate, crank time
may be less than 3 seconds.
Wait 3 minutes of rest time
before the next crank.
Check for poor connection at
battery and frame.
Check power cord and extension
cord for loose fitting plug.
Check for open fuse or circuit
breaker supplying AC outlet.
The thermal protector may
have tripped and needs a little
longer to close. Make sure the
charger vents are not blocked.
Wait and try again.
On a severely discharged
battery, charge for 10 to
15 minutes at the FAST
charge rate to help assist in
cranking.
Charger will not turn on when
properly connected.
AC outlet is dead.
Poor electrical connection.
Check for open fuse or circuit
breaker supplying AC outlet.
Check power cord and
extension cord for loose
fitting plug.
Battery clips do not spark
when touched together.
The charger is equipped
with an auto-start feature. It
will not supply current to the
battery clips until a battery is
properly connected. Unlike
traditional chargers, the
clips will not spark if touched
together.
No problem, this is a normal
condition.