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Ξ Select the CHARGE position on the SELECT
E
FUNCTION switch.
n
The battery should now accept the charge and the
amperage meter should indicate 6–15 amps. If not, the
g
battery should be professionally tested. If battery is okay,
l
call Technical Service at (866) 236-0044.
i
MODEL 87120
s
This charger will taper its charge as the battery
h
approaches full charge. Refer to Section L, Time to
Charge to determine how long to charge your battery.
Step 1: Make Connections
Make sure ac power cord is unplugged from wall outlet.
Make proper connections to the battery as explained in
sections F through H.
Step 2: Select Setting
Select the 70 AMP START
position if you are attempting
to start a car with a weak
battery (12V only). Plug the
ac power cord into the wall
outlet.
Note: For best results,
charge the battery
first for 10–20 minutes using the 10 A 12 V
position before attempting to start the vehicle in
the 70 AMP START position.
Engage the starter for 3–4 seconds; if engine fails to start,
charge the battery using the 10 A 12 V position for another
10–20 minutes and attempt to start the engine again. Be
aware that a typical starter on a vehicle may need 250-500
amps to start the engine.
Select the 10 A 12 V AUTO position if you are charging
large lead acid batteries, such as those used in
automobiles, boats, trucks, vans, farm equipment, etc.
Plug the ac power cord into the wall outlet. The meter will
read up to 15 amps and taper down to 6 or 7 as the
battery reaches full charge. When the battery is fully
charged you must shut off the charger within 2 hours or
overcharging will occur.
Select the 2 A 12 V AUTO position for charging lawn
tractor, motorcycle, snowmobile, or other small batteries.
Plug the ac power cord into the wall outlet. The meter will
read up to 5 amps and taper down to around 1 amp as the
battery reaches full charge.
Select the 10 A 6 V position for charging 6 volt batteries
used in automobiles, trucks, and farm equipment. This
setting does not taper and also does not shut off
automatically.
Note: Do not use this battery charger to charge batteries
larger than those typically found in boats,
passenger cars, or light trucks.
MODEL 87121
This charger is equipped with Auto On-Off Technology.
After connecting to a 12 volt battery, the charger needs to
sense a minimum voltage condition to begin charging and
it will stop charging when it reaches the maximum voltage
condition, but it will continue to monitor the battery charge
level. The charger will "hum" as it monitors. If the battery
SELECT SETTING
70 AMP
12A 2A
OFF
START
charge level drops, the charger will begin charging again.
Note: If the charger does not sense a minimum voltage
condition because of a deeply discharged battery,
then preactivation of the battery is required. The
meter will read zero or near zero.
Step 1: Make Connections
Make sure ac power cord is unplugged from wall outlet.
Make proper connections to the battery as explained in
sections F through H.
Step 2: Select Function (Switch 1)
CHARGE position to charge the
battery. This is the automatic
mode for 12 volt batteries.
Select the START position if
you are attempting to start a car
with a weak battery or to
preactivate a discharged
battery.
Step 3: Select Setting (Switch 2)
Select the 70 AMP START
position if you are
attempting to start a car
with a weak battery (12V
only). Plug the ac power
cord into the wall outlet.
Note: For best results,
charge the battery first for 10–20 minutes using
12
the 10 A 12 V position before attempting to start
the vehicle in the 70 AMP START position.
Engage the starter for 3–4 seconds; if engine fails to start,
charge the battery using the 10 A 12 V position for another
10–20 minutes and attempt to start the engine again. Be
aware that a typical starter on a vehicle may need
250–500 amps to start the engine.
12
Select the 10 A 12 V AUTO position if you are charging
large lead acid batteries, such as those used in
automobiles, boats, trucks, vans, farm equipment, etc.
Plug the ac power cord into the wall outlet. The meter will
read up to 15 amps and taper down to 6 or 7 as the
battery reaches full charge. When the battery is fully
charged the charge complete light will come on, the meter
will drop to 0 amps, and the charger will automatically stop
charging.
Select the 2 A 12 V AUTO position for charging lawn
tractor, motorcycle, snowmobile, or other small batteries.
Plug the ac power cord into the wall outlet. The meter will
read up to 5 amps and taper down to around 1 amp as the
battery reaches full charge. Using this setting for large
automotive, truck, or marine batteries will not allow the
charger to shut off automatically.
12
Select the 10 A 6 V position for charging 6 volt batteries
used in automobiles, trucks, and farm equipment. Plug the
ac power cord into the wall outlet. This setting does not
taper and does not shut off automatically.
Charge
Charge
a 12V
a 12V
Automotive
Small
Select
Battery
Battery
Function
CHARGE
CHARGE
Setting
12A 12V
2A 12V
6
Select the
SELECT FUNCTION
CHARGE START
SELECT SETTING
70 AMP
12A 2A
12A
12V AUTO
6V MANUAL
START
Charge
Attempt
Pre-activate
a 6V
to Start
a Low
Battery
an Engine
Battery
CHARGE
START
START
12A 6V
70A START 12A 12V
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