Midtronics MDX-P300 Instruction Manual download pdf (Page 13)

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Test Messages

In some cases the tester asks for additional information before completing

a test. It may also warn you of a condition that prevents proper testing.

Test Message Interpretation

BATTERY TEMP.

ABOVE or BELOW

0° F

If the tester detects that the temperature of the

battery may make a difference in the result, it

will ask you to select if the battery temperature is

above or below 0 ˚F. It will resume the test after

you make your selection.

BEFORE or

AFTER CHARGE

For a more decisive result, the tester may ask if

you are testing the battery before or after charging.

If the vehicle has just been driven, select BEFORE

CHARGE. It will resume the test after you make

your selection.

continued

Decision Interpretation

CHARGING

VOLTAGE HIGH

(continued)

The regulator controls voltage output based on

the battery voltage, under-hood temperature, and

vehicle loads used. In other words, it controls the

maximum voltage the system can produce based

on the current needs and amount of current that

can be produced by the spinning of the rotor in

the alternator. The normal high limit of a typical

automotive regulator is 14.5 volts +/–0.5. Refer

to the manufacturer speciﬁcations for the correct

limit, which may vary by vehicle type.

A high charging rate will overcharge the battery

and may decrease its life and cause it to fail. If the

battery test decision is REPLACE and the charging

system test shows CHARGING VOLTAGE HIGH,

check the battery’s electrolyte levels. A symptom of

overcharging is battery ﬂuid spewing through the

vent caps, which causes low electrolyte levels and

harms the battery.

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Midtronics MDX-P300 Instruction Manual Page 13