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12 VOLT
2 AMP
12 VOLT
15 AMP
OFF
6 VOLT
125 VOLT ENGINE START
6 VOLT
15 AMP
MANUAL
12 VOLT
125 AMP
ENGINE
START
OFF: This position disconnects AC power supplied by your out-
let from the rest of the charger.
6 VOLT 15 AMP: Used for charging medium and large size 6
volt batteries, typical application are for crank starting of farm
equipment and antique automobiles. Do not charge small bat-
teries such as used in motorcycles, lawn and garden equip-
ment.
12 VOLT 2 AMP: The 2 Amp charge rate is recommended for
small batteries, motorcycles etc. If used for maintaining the full
charge level of larger batteries, limit the charge period to a few
days at a time. This amperage setting is both automatic or
manual. See switch below.
12 VOLT 125 AMP START: Used for crank starting of 12 volt
vehicles. The engine start position should not be used for bat-
tery charging, doing so will cause the charger to over heat and
thus protect itself by cycling off and on.
12 VOLT 15 AMP: Use for charging medium and large size
batteries. This most popular charge rate can operate in either
the Automatic or Manual mode of charging. See Automatic/
Manual 3-way Switch.
6 VOLT 125 AMP START: Used for crank starting of 6 volt ve-
hicles.
NOTE: Not recommended for use on 8 volt systems.
METER: The meter indicates the amount of current measured
in amperes that is being drawn from the charger by a battery. In
the 15 Amp charge rate a typical discharged battery may ini-
tially draw more than 15 Amps during the first few minutes of
charge. As the battery continues to charge current should gradu-
ally taper to within 6 to 8 amps at full charge.
The START area of the meter is reserved to indicate when a
high rate of current is being drawn from the charger. It is normal
for the meter pointer to be in this area while cranking a vehicle.
When using the 2 amp charge rate the meter may indicate some
activity but doesn’t have the resolution to accurately display the
battery’s state of charge. For this reason you should depend on
the full charge light indicator.
ENGINE START:
1. Set 3-way switch to “MANUAL” setting.
2. Connect the battery charger as outlined in Section H.
3. For best results charge the battery for 10 minutes before
cranking the engine at 15 amp setting.
4. Set the rotary charge rate selector switch to the 125 Amp
start position that matches the voltage of the vehicle’s battery
– 6 or 12 volt.
5. Crank the engine for 5 seconds, if the engine fails to start,
set the charge rate switch to the 15 Amp rate and charge
the battery for the next 5 to 10 minutes before cranking
again.
6. If the engine fails to start after several tries, there maybe a
problem elsewhere in the vehicle.
VOLT/AMP SELECTOR FOR MANUAL OPERATION
(For Automatic operation, set dial to any
position except (OFF.)
MODEL: SF-125A
TYPICAL DISPLAY FOR A FULLY
CHARGED BATTERY AT THE 15
AMP CHARGE RATE
TYPICAL DISPLAY FOR A
DISCHARGED BATTERY
AT THE 15 AMP RATE
Percent
➞
REVERSED
HOOKUP
(RED
INDICATOR)
FULL
CHARGE
(GREEN
INDICATOR)
➞➞
➞➞
➞
➘
➘
START
% 100 75 50 25 0
▲
MANUAL
▲
BATTERY TYPE SWITCH
2 AMP, 12 VOLT AUTOMATIC
▲
15 AMP, 12 VOLT
AUTOMATIC
D. METER AND SWITCH FUNCTIONS