20
5. Turn multimeter rotary switch
to 200mV DC range.
If multimeter overranges, turn mul-
timeter rotary switch to the
2000mV DC range. (See Setting
the Range on page 8.)
6. Crank engine until steady
reading is on display.
• Record results at each point
as displayed on multimeter.
• Repeat Step 4 & 5 until all
points are checked.
7. Test Results –
Estimated Voltage Drop of
Starter Circuit Components
Component Voltage
Switches 300mV
Wire or Cable 200mV
Ground 100mV
Test Procedure (see Fig. 20):
1. Disable ignition system so ve-
hicle won’t start.
Disconnect the primary of the
ignition coil or the distributor pick-
up coil or the cam/crank sensor
to disable the ignition system.
Refer to vehicle service manual
for disabling procedure.
2. Insert BLACK test lead into
COM test lead jack.
3. Insert RED test lead into
test lead jack.
4. Connect test leads.
Refer to Typical Cranking Volt-
age Loss Circuit (Fig. 20).
•
Connect RED and BLACK test
leads alternately between 1 & 2,
2 & 3, 4 & 5, 5 & 6, 6 & 7, 7 & 9,
8 & 9, and 8 & 10.
Red Black
Fig. 20 Typical Cranking Voltage
Loss Circuit
Solenoid
This is a representative
sample of one type of
cranking circuit. Your vehicle
may use a different circuit
with different components or
locations. Consult your
vehicle service manual.
Starter
Voltage Drops
This test measures the voltage drop across wires, switches, cables, solenoids,
and connections. With this test you can find excessive resistance in the starter
system. This resistance restricts the amount of current that reaches the starter
motor resulting in low battery load voltage and a slow cranking engine at starting.
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