Craftsman 934.716140 Owner's Manual page 28

PRE-CHARGE BATTERY ACTIVATION (12 Volt Only)
PRE-CHARGE BATi"ERY ACTIVATION
The need for pre-charge activation is indicated when the ammeter
reads zero and neither the REVERSE HOOK-UP or CHARGE
COMPLETE indicators are lit, or if a battery is known to be dead
and the CHARGE COMPLETE light comes on after charging just
a few minutes. It should be needed only when charging sulfated
or deeply-discharged lead-calcium batteries (such as the Delco
Freedom and many newer automotive batteries).
Pre-charge activation is a two-step process:
CHARGER ACTIVATION - These types of batteries can be down
to such a low voltage (less than I volt) that they can "trick" the
automatic circuit into thinking that the charger is not connected to
a battery and will not allow charging to begin. The automatic
circuit must then be temporarily bypassed until the battery voltage
is raised to alevel that the charger can detect.
CAUTION - IF "CHARGE COMPLETE" INDICATOR IS LIT, DO
NOT ATTEMPT PRE-CHARGE ACTIVATION UNTIL VERIFYING
(WITH HYDROMETER OR ELECTRONIC PERCENT OF
CHARGE TESTER) THAT THE BATTERY iS DISCHARGED.
1. With the AMP SELECTOR set to the desired charge setting,
move the FUNCTION SELECTOR to ACTIVATE. The
charger's automatic circuit is now bypassed and the charger is
in a manual charge mode.
2. Allow the charger to charge for 10 minutes, then move the
FUNCTION SELECTOR back to CHARGE to return to
automatic charging.
The green light and ammeter needle will now be pulsing rapidly.
The pulsing will begin to s!ow and the ammeter needle will be
slightly off zero. When the needle reaches about 2 amps, the
green lightwill go off completely.
3. The charger is now in control of the charging process.
NOTE: if the green light goes out AND the ammeter falls back to
zero, repeat steps 1 and 2 above.
BATTERY ACTIVATION - After activating the charger, the
ammeter may continue to display very low amps until the sulfate
barrier, on the plates of the battery, is broken through. This can
take as long as 4 to 8 hours. After breaking through the sulfate
barrier, the ammeter will register higher amps. Charging will now
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