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 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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91129 specifications

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Harbor Freight Tools 91129 operating instructions Testing the Charging System

Models: 91129