Harbor Freight Tools 91129 Battery Charger User Manual


 
Page 6SKU 91129 For technical questions, please call 1-800-444-3353.
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.
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.
(Display Reading)
BATTERY CONDITION
OK
(Green area)
Battery capacity is good. May or may not be fully charged. Check the
charge state by testing the Specific Gravity (SG) with a Hydrometer.
If SG is less than full charge, check for possible charging system
trouble. Recharge to full level.
BAD
(Red area)
If the DC Volt Meter needle is falling, the battery is defective or has a
bad cell. For a quick check, turn the Load Knob down,
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
(Alt. & Reg. Test)
If the DC Volt Meter needle reads OK, charging system is functional.
If it falls on the low red or high red areas, charging system may be
malfunctioning.
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.