
TROUBLESHOOTING AND ELECTRICAL SYSTEM
Test Procedures
2005 FE350 Gasoline Vehicle Maintenance and Service Supplement
Page 11-19
11
TEST PROCEDURE 4 – KEY SWITCH (STARTER CIRCUIT)
See General Warning, Section 10, Page 10-1.
1. Disconnect the battery cables as instructed.
See WARNING “To avoid unintentionally starting...” in
General Warning, Section 10, Page 10-1.
2. Remove the center dash assembly.
See Key Switch Removal, Section 12, Page 12-13.
3. Ensure that the wires are connected correctly and are tight. If they are not, rewire or tighten as necessary.
4. Pedal-Start vehicles:
4.1. Insert the key and turn the key to ON. Place the red (+) probe of the multimeter on the (2) terminal
and the black (–) probe on the (1) terminal of the key switch. The reading should be continuity. If
the reading is incorrect, replace the key switch
(Figure 11-13, Page 11-20)
.
5. Key-Start vehicles:
5.1. Insert the key and turn the key to ON. Place the red (+) probe of the multimeter on the (B) terminal
and the black (–) probe on the (A) terminal of the key switch. The reading should be continuity. If
the reading is incorrect, replace the key switch.
See Key Switch Removal, Section 12,
Page 12-13.
5.2. With the key still in the ON position, place the red (+) probe of the multimeter on the (B) terminal
and the black (–) probe on the (S) terminal of the key switch. The reading should show no continuity.
If the reading is incorrect, replace the key switch. If the reading is correct, leave the probes con-
nected and proceed to the next step.
5.3. Insert the key and hold the key in the START position. The reading should be continuity. If the read-
ing is incorrect, replace the key switch
(Figure 11-14, Page 11-20)
. With the red (+) probe of the
multimeter on the (B) terminal and the black (–) probe on the (A) terminal of the key switch, the
reading should be continuity. If either reading is incorrect, replace the key switch.
See Key Switch
Removal, Section 12, Page 12-13.
Figure 11-12 Battery Ground Cable Test
Place black (–)
probe on
frame.
Disconnect the 6-gauge
black wire from the battery.
Place red (+) probe on
disconnected end of cable.
2m
20
m
200
m
2k
200
200
200
200
20
2
200
m
500
20k
200k
2000
k
1000
OFF
WAVETEK
5XL
V
V
V
A
!
!
COM
200nA
MAX
1000 ---
750V
FUSED
200 OHM
SETTING