Schumacher XC75 Battery Charger User Manual


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NOTE: The battery tester is only designed to test batteries. Testing a device
with a rapidly changing voltage could yield unexpected or inaccurate results.
Using the Alternator Performance Tester
Overview
This battery charger has a built-in alternator tester that displays an estimate of
the alternator’s relative output compared to normal alternators. The alternator
% values displayed should be taken as a general reference, not a precise
diagnosis. The alternator tester functions the same as the built-in battery
voltagetester(seeprevioussectionfordetails)withafewdifferences.
Testing Sequence: There are three basic steps required to operate this unit
as an alternator tester:
With the charger unplugged from the AC outlet, connect the charger to the 1.
battery following the instructions given in Sections 6 and 7.
Plug the charger AC power cord into the AC outlet, following the 2.
instructions given in section 8.
Start the vehicle, and turn on the vehicle’s headlights. Read the voltage on 3.
the digital display. If you get a reading between 13.4 volts and 14.6 volts,
the alternator is working properly. If the reading is less than 13.5 volts or
morethan14.5volts,havethechargingsystemcheckedbyaqualied
technician.
Tester Status LEDs: When the charger is operating as an alternator tester,
the status LEDs light under the following conditions:
The • CHARGED LED will light if the output of the charging system is at
the normally desired level.
The CHARGING LED • does not light in the alternator test mode.
The • CONNECTED LED lights if the tester detects a properly connected
battery.
Alternator Testing Notes
The alternator percent display can range from zero to 199.•
An alternator % of zero does not indicate an alternator output of zero volts, •
it indicates an output too low to charge the battery.
An alternator % of 199 does not indicate an alternator voltage nearly twice •
the voltage of a normal alternator.
General Charging Notes
Fan:Thechargerisdesignedtocontrolitscoolingfanforefcientoperation.
Consequentially, it is normal for the fan to start and stop when maintaining a
fully charged battery. The fan does not run in Tester Mode. Keep the area near
thechargerclearofobstructionstoallowthefantooperateefciently.
CALCULATING CHARGE TIME12.
Use the following table to more accurately determine the time it will take to
bringabatterytofullcharge.First,identifywhereyourbatterytsintothe
chart.
NR means that the charger setting is NOT RECOMMENDED.
Find your battery’s rating on the chart below, and note the charge time given
for each charger setting. The times given are for batteries with a 50% charge
prior to recharging. Add more time for severely discharged batteries.
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