Schumacher 520A-PE, Owner'S Manual, Page: 6 / 16

6
PROBLEM POSSIBLE SOLUTION
No meter reading. Charger is not plugged in Plug in.
Connections are reversed. With charger unplugged, reverse clips and
reconnect (rock back and forth to bite in).
Poor electrical connection. Clean clips and battery poles and reconnect
(roll back and forth to bite in).
AC outlet is dead. Plug in a lamp or other appliance to check for
voltage.
Battery is defective (will not accept Have battery checked.
charge).
Charger will not turn on (when Battery recently used in vehicle and is Battery does not need charging.
properly connected to power. fully charged.
(If battery is in vehicle turning on headlights
will lower battery voltage in a few seconds and
charger should then turn on.)
Battery has less than .7 volts set to manual
and retry.
Charger will not turn OFF. Battery has problem and will not take Have battery checked.
full charge. (If in MANUAL, switch to AUTOMATIC).
Ammeter needle pulses (fluctuates) Two or more batteries connected in Requires more time to charge: continue
every few seconds AFTER THREE parallel. charging.
HOURS without slowing down.
Battery of 200 ampere hours or larger. Requires more time to charge: continue
charging.
Battery is connected to application that
draws a small current (such as an auto
dome light).
Charging current is less than full Battery is partially charged. Continue charging.
output rating of charger.
Battery is defective (battery plates are Have checked and replace battery.
crusted) and will not accept a full
charge.
AC power supply is low. Plug charger into another grounded AC outlet.
Ammeter needle moves to extreme Severely discharged battery (but Allow charging to continue until battery has
right, remains a short time, then otherwise good battery). recovered sufficiently to take a charge (Circuit
returns to zero, accompanied by a breaker will continue to cycle and needle will
clicking sound. swing side to side until battery has recovered).
In MANUAL with battery connections Unplug charger and change to correct
reversed. connections.
Battery is defective (will not accept Have battery checked.
charge)
Charger is cycling after circuit breaking Wait until charger automatically resets itself
overload. (DO NOT RETURN FOR SERVICE).
The battery charger is designed to work automatically. However, If a problem does occur, check the following:
J. TROUBLESHOOTING