Operation, Testing the Battery | Harbor Freight Tools 91129 manual

Operation

Testing the Battery

1.Wipe the battery terminals with a cloth to remove any dirt and grease.

2.Make sure the Load Knob (C) is in the off position. Connect the red (positive) Cable Clamp (A) to the positive terminal (+) on the 12 V battery. See photo on page 4.

3.Connect the black (negative) Cable Clamp (B) to the negative terminal (–) on the battery.

4.Turn the Load Knob (C) clockwise until the DC ammeter reads 1/2 the Cold Crank Amp (CCA) rating or three times the amphour (AH) capacity of the battery. The CCA and AH rating are printed on the battery label.

Maintain load for 15 seconds to simulate an actual load on the battery. After 15 seconds has passed, the unit will sound with a beep.

5.View the DC Volts Meter and read the battery condition. Refer to the “Battery Condition Analysis” section on the next page.

6.Turn the Load Knob (C) counterclockwise to Off, and remove the Cable Clamps from the battery.

Note: Freezing temperatures affect the battery test reading. Decrease the battery rating 50 cold cranking amps for each 50°F (10°C) below freezing 30°F (0°C).

Battery Test: Green

Amps Scale

- OK

Red - Replace

Amp Hour Scale

State of Charge:

CCA Scale

Green - OK

Red - Recharge

Alternator &

Regulator Test:

Green - OK

Red - Low

Load Knob (C)

Negative	Positive
Cable (-)	Cable (+)

SKU 91129

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

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91129 specifications

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