Battery/Charger Information
Problem
Cause
Solution
When plugged into AC power LED
fl
ashes
red/green.
Connected reverse to battery, or not con-
nected to battery.
Correct polarity, or connect to battery.
Break in DC cord, or connector.
Have a quali
fi
ed person make repair.
Battery too dead to charge.
Replace.
When plugged into AC power LED does not
come on.
No AC power.
Check circuit.
Check extension cord for breaks or damage.
When I put a volt meter across the output of
charger there is no power coming out when I
plug it in.
Charger must be connected to a battery to
turn on.
Connect charger to battery.
Batteries don’t receive a full charge.
Charger is too small for the battery.
Check that charger’s output is about 10% of
the amp hour rating of the battery.
Charge pro
fi
le is not set correctly.
Recheck the dip switch setting. If in doubt,
contact National.
Cycle needs more time.
Use only a 3 m (7’) properly gauged exten-
sion cord when charging.
Battery is defective.
Replace.
When switched on, LED
fl
ashes red/yellow.
Charger and battery voltage mismatch.
Connect charger to a battery(s) with the
same voltage rating.
When powered up LED is solid red with a
yellow
fl
ash.
Battery is very low, and charger is in a slow
charge phase until the voltage rises to a safe
level before full turn on.
Leave connected, it may take hours, but if
the voltage rises even a little bit, it should
recover and turn the charger full on. (Do not
allow your batteries to deep discharge, it is
the number one cause of premature battery
failure.)
Charger blows it’s fuse, or branch circuit fuse/
circuit breaker as soon as it’s switched on.
Charger is shorted.
Contact National or an authorized distrubu-
tor’s service facility.
Charger blows the branch circuit fuse/circuit
breaker a short while after being switched on.
Branch circuit is too small.
Relocate charger to a branch circuit with a
heavier rating, or remove other loads on the
circuit.
After a full charge, the batteries die quickly.
Batteries are sulfated.
Sometimes batteries can be recovered.
Leave charger on for some hours, if voltage
falls and current begins to rise, it is a good
sign they can recover under normal charging.
All other issues.
Please call National or an authorized distribu-
tor’s service facility.
www.nationalequipment.com
Phone: 763-315-5300
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