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ALTERNATOR VOLTAGE CHECK
ALTERNATOR VOLTAGE CHECK
PART 1: No Load
(turn OFF all accessories): The battery must be fully charged before testing the alternator. Run the engine
long enough to achieve normal idle speed and verify there is a no-load voltage.
1) Press ALTERNATOR check button to start the check,
2) The "ALTERNATOR GOOD" led will light up to indicate the alternator is good, or the FAULT LED will lights up to indicate
the alternator voltage is not good
3) Press the ALTERNATOR CHECK button again to stop the test
PART 2: Unde Load
(accessories ON): Next, load the alternator by turning on as many accessories as possible (except
for A/C and DEFROST)
1) Press ALTERNATOR check button to start the check,
2) The "ALTERNATOR GOOD" led will light up to indicate the alternator is good, or the FAULT LED will lights up to indicate
the alternator voltage is not good
3) Press the ALTERNATOR CHECK button again to stop the test
If the first alternator check indicates a good alternator and the second indicates the alternator is bad, the problem could stem
from: loose fan belts, an intermittent diode failure or possibly bad connections between the battery and alternator and/or
ground.
With minimal maintenance, the VEC1093 A 2/10/20/40 Smart Battery Charger will deliver years of dependable service.
Follow these simple steps to maintain the charger in optimum condition:
• After each use, clean battery charger clamps - be sure to remove any battery fluid that will cause corrode
copper clamps.
• Clean outside case of charger with a soft cloth and, if necessary, mild soap solution.
• Do not allow liquid to enter the charger. Do not operate when charger is wet.
• Store charger cords loosely coiled to prevent damage to the cords. Do not use charger if cords or clamps have been
damaged in any way - call Vector Technical Support Department toll-free: (866) 584-5504 for replacement cords and clamps.
VEC1093 A
REV101103
NOTE:
This check may not be accurate for every make, manufacturer and model of vehicle. There is wide variation
in user-controlled electrical loads, alternator output and wiring. Other factors include battery condition,
temperature, and engine idle speed. It is recommended to check your alternator when it is known to be
operating properly to verify that this check is valid for your particular vehicle. Check only 12V systems.
Checking 24 or 36V systems will damage charger.
NOTE:
: It may be that someone has added a number of accessory loads on the charging system, thereby
increasing current demand from the alternator.
MAKE SURE THAT THE ALTERNATOR IS RATED TO THE APPLICATION.
NOTE:
: Do not charge the battery while waiting for the engine to warm. This will invalidate any alternator
check. The digital display should show the circulating pattern while the engine is warming.
Do not turn on A/C or the defroster system to load the alternator. These accessories may start
operating during a test sequence and give an invalid result.
CARE AND MAINTENACE
