Schumacher Automatic PSW-70300A User Manual

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Set the charge rate switch and the timer to the OFF position.

With the charger unplugged from the AC outlet, connect the charger to the battery

following the instructions given in Section 6 (FOLLOW THESE STEPS WHEN THE

BATTERY IS INSTALLED IN A VEHICLE).

Plug the charger AC power cord into the AC outlet, and then move the timer switch

from OFF to the HOLD position.

With the charger plugged in and connected to the battery of the vehicle, set the

charge rate selector switch to the engine start position.

Crank the engine until it starts or 3 seconds pass. If the engine does not start, wait 3

minutes before cranking again. This allows the charger and battery to cool down.

NOTE: During extremely cold weather, or if the battery is under 2 volts, charge the

battery for 5 minutes before cranking the engine.

If the engine fails to start, charge the battery for 5 more minutes before attempting to

crank the engine again.

After the engine starts, move the charge rate selector switch to the OFF position and

unplug the AC power cord before disconnecting the battery clips from the vehicle.

Clean and store the charger in a dry location.

NOTE: If the engine does turn over but never starts, there is not a problem with the

starting system; there is a problem somewhere else with the vehicle. STOP cranking the

engine until the other problem has been diagnosed and corrected.

Using the Battery Voltage Tester

Overview

This battery charger has a built-in voltmeter to test your battery’s state of charge. The

charger does not have a built in load tester. As such, a recently charged battery could

have a temporarily high voltage due to what is known as “surface charge”. The voltage

of such a battery will gradually drop during the period immediately after the charging

system is disengaged. Consequently, the tester could display inconsistent values for

such a battery. For a more accurate reading, the surface charge should be removed

by temporarily creating a load on the battery, such as by turning on lights or other

accessories for a couple of minutes before you read the display. Read it a couple of

minutes after you have shut the headlights off.

Testing Sequence: There are four basic steps required to test the battery state of charge:

With the charger unplugged from the AC outlet, connect the charger to the battery

following the instructions given in Sections 6 and 7.

Set the charge rate switch and the timer to the OFF position.

Plug the charger AC power cord into the AC outlet, following the instructions given in

Section 8.

Read the voltage on the voltmeter.

Using the Alternator Performance Tester

Overview

This battery charger has a built-in alternator tester that displays an estimate of the

alternator’s relative output compared to normal alternators. The alternator % values

displayed should be taken as a general reference, not a precise diagnosis. The

alternator tester functions the same as the built-in battery voltage tester (see previous

section for details) with a few differences.

Testing Sequence: There are four basic steps required to operate this unit as an

alternator tester:

With the charger unplugged from the AC outlet, connect the charger to the battery

following the instructions given in Sections 6 and 7.

Set the charge rate switch and the timer to the OFF position.

Plug the charger AC power cord into the AC outlet, following the instructions given in

Section 8.

Start the vehicle and turn on the vehicle’s headlights. Read the voltage on the voltmeter.