Schumacher Electric SE-40MAP Owner's Manual page 18

PROBLEM
The measured current is
much lower than what was
selected.
Ammeter reads less than
selected charge rate when
charging a discharged
battery
The charger is making an
audible clicking sound.
Charger makes a loud
buzz or hum.
POSSIBLE CAUSE
The charger reached the
maximum voltage and is
reducing the current.
Extension cord is too long
or wire gauge is too small.
Weak cell or sulfated plate
in battery.
Battery is only partially
discharged.
Circuit breaker is cycling.
Battery is defective.
Shorted battery cables or
clips.
Severely discharged bat-
tery, but otherwise it is a
good battery.
Reverse connections at
battery.
Transformer laminations
vibrate (buzz).
Shorted Diode Assembly or
Output Rectifier Assembly
(hum).
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REASON/SOLUTION
No problem, this is a normal
condition.
Use a shorter or heavier
gauge extension cord.
A sulfated battery will even-
tually take a normal charge
if left connected. If the bat-
tery will not take a charge,
have it checked.
Continue to charge the
battery.
The settings may be wrong.
Check the charger settings.
Have the battery checked.
Circuit breaker cycles when
current draw is too high.
Check for shorted cables or
clips and replace if neces-
sary.
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 connec-
tions.
No problem, this is a normal
condition.
Have charger checked by a
qualified technician.