E N G L I S H
44
RED (+)
POSITIVE
BATTERY
CABLE
NEGATIVE
BATTERY
CABLE
BLACK (+)
NOTE: The ignition switch must be off
when connecting or disconnecting battery
cables to prevent damaging the vehicle
computer.
Connect:
• Black test probe to the negative (–)
battery post.
• Red test probe to the positive (+) battery
post.
A reading of less than 12.4V indicates an
undercharged battery. Recharge before
testing.
NO LOAD 12V VEHICLE BATTERY TEST
(Meter Reading)
(% Battery Charge)
12.6 V (or greater)
100%
12.45 V
75%
12.30 V
50%
12.15 V
25%
Voltage Load Test
Batteries are often blamed for “No–Start”
conditions, when in fact the real problem
exists in the charging system. After the
charging system problem exists for some
period of time the battery will become
discharged and will not be able to supply
enough current for the starter to crank the
engine.
This test checks for the battery’s capacity to
deliver sufficient cranking voltage.
To measure voltage load:
• Set the rotary switch to voltage ( ).
Connect:
• Black lead to the negative (–) battery
post.
• Red lead to the positive (+)battery post.
Crank the engines for 15 seconds after
disabling the ignition and check the
minimum display.
A reading of less than 9.40V at 60°F/16°C
indicates a weak battery. Recharge or
replace the battery before testing.
RED (+)
BLACK (+)
VOLTAGE LOAD TEST
(Meter Reading)
(% Battery Charge)
10.0 V
90° F /33° C
9.8 V
80° F /27° C
9.6 V
70° F /21° C
Summary of Contents for UD226
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