Schumacher PST-200 User Manual download pdf (Page 3)

If the tester indicates poor battery condition, allow the battery to stabilize for a few

minutes and check the open circuit voltage with voltmeter. This is a good measure

of the percent charge in the battery. The battery is considered charged if it mea-

sures 75% or more. If it failed the load test with 75% charge or above, it should be

replaced. If the battery charge measures less than 75%, it should be charged and

load tested again. Replace the battery if it fails again. The values in the following

chart are for a 12 volt battery:

OPEN CIRCUIT VOLTS* PERCENT OF CHARGE

11.7 Volts or lower 0

12.0 25

12.2 50

12.4 75

12.6 or higher 100

TESTING THE CHARGING SYSTEM - after battery load test

1. With the tester still connected to the battery, press “START TEST” to toggle the

“TEST STATE” lights from “LOAD” to “CHARGING”.

2. Start the engine and allow it to reach normal operating temperature.

3. Run engine at 1200 to 1500rpm. CAUTION: Stay clear of moving engine parts.

4. Read the results. Illumination of the RED-”BAD” light indicates a problem in the

charging system that will undercharge a battery (less than 13.6V), or overcharge

the battery (over 14.8v)

STARTER MOTOR TEST (12 VOLT VEHICLES ONLY)

This test identifies excessive starter current draw, which makes starting difficult

and shortens battery life. Perform battery load test-first to make sure battery is in

“GOOD” condition.

ENGINE MUST BE AT NORMAL OPERATING TEMPERATURE

1. Connect negative (black) clamp to the negative (NEG, N, -) battery post. Connect

positive (red) clamp to the positive (POS, P, +) battery post. ROCK clamps back

and forth to ensure a good electrical connection. Do not click “START TEST”.

2. Disable the system ignition so the vehicle engine will not start.

3. Crank the engine and note the voltage reading during engine cranking.

4. A meter reading of 9 volts or less indicates excessive current draw. This may be

due to bad connections, a failing starter motor, or the battery is too small for the

vehicle’s requirements.

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Schumacher PST-200 User Manual Page 3