Harbor Freight Tools 3418 - Manual (Page 7)

Page 7 SKU 03418 For technical questions, please call 1-800-444-3353.
SETUP
About Charging Batteries
Batteries draw as much power as they need from the charger. The charger does not
force current into the battery. When a battery is close to dead or very low charged, it will want
to draw more current. When a dead or low battery is charged, the charger’s ammeter will
register at the high end. As the battery charges, the reading will move down toward the low
end, resting on zero, when the battery is fully charged. See FIGURE 1 below.
Note: The ammeter shows the amount of current being drawn from the charger. It does not
show what the charger is capable of delivering. When the battery is fully charged and
registering zero on the ammeter, a small trickle charge will continue to move from the
charger to the battery. If you do not disconnect the charger from the battery, eventually
the heat build up from the trickle charge will cause the battery acid to boil and overcharge
the battery causing damage to the battery. You must constantly monitor battery charging
progress and if battery gets warm, stop charging it immediately.
Note: This charger is not recommended for batteries with a built in Hydrometer eye. The
reading of the built in eye will conflict with the ammeter readings.
DO NOT PLUG ThIS ChARGER IN UNTIL DIRECTED TO DO SO
IN ThE FOLLOWING PAGES OF ThIS MANUAL.
Preparing the Battery
If necessary, remove the battery from the vehicle to charge it. When removing the 1.
battery, always remove the grounded battery cable first.
Reminder: The vehicle’s engine must be OFF when removing, replacing, or charging
a battery.
REV 08f, 09h