Testing the Charging System

1.Turn the Load Knob (C) counterclockwise to the Off position.

2.Connect the Cable Clamps to the battery as previously described.

Avoid Carbon Monoxide poisoning. This gas comes from the vehicle’s exhaust and is colorless and odorless. It can cause SERIOUS INJURY or DEATH if inhaled.

3.Outside, or in a well ventilated area, start the vehicle engine and run at fast idle speed.

4.View the DC Volt Meter and read the Alt. - Reg. condition. Refer to the “Battery Condition Analysis” section below.

5.Turn the vehicle’s engine off, then remove the Load Tester Cable Clamps.

 

Battery Condition Analysis

 

 

LOAD TEST / 15 Sec.

BATTERY CONDITION

(Display Reading)

 

 

Battery capacity is good. May or may not be fully charged. Check the

OK

charge state by testing the Specific Gravity (SG) with a Hydrometer.

(Green area)

If SG is less than full charge, check for possible charging system

 

trouble. Recharge to full level.

 

If the DC Volt Meter needle is falling, the battery is defective or has a

BAD

bad cell. For a quick check, turn the Load Knob down,

(Red area)

counterclockwise and note DC Volt Meter reaction. If voltage

 

recovers to its full potential after only a few seconds, the battery is

 

probably defective. If the voltage recovers slowly, the battery may

 

only be run down. Check specific gravity level, recharge, and re-test.

CHARGING SYSTEM

If the DC Volt Meter needle reads OK, charging system is functional.

(Alt. & Reg. Test)

If it falls on the low red or high red areas, charging system may be

 

malfunctioning.

SKU 91129

For technical questions, please call 1-800-444-3353.

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Harbor Freight Tools 91129 operating instructions Testing the Charging System
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91129 specifications

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