TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
Test Procedures
12
3.
Press the upper and lower retaining tabs and push the light switch out of the instrument panel.
4.
Use a multimeter set to 20 volts DC and place alligator clips on the multimeter probes. Connect the red (+) probe
to the light switch terminal where the blue wire (w03) is connected
.
5.
Connect the black (–) probe of the multimeter to the negative (–) post of the battery.
6.
With the light switch in the OFF position, the reading should indicate 0 volts. With the light in the ON position, the
reading should indicate between 11 and 12.5 volts. If the there is no voltage reading, check the continuity of the
10-gauge red wire (w126) from the fuse block to the starter solenoid. Check the continuity of the 14-gauge yellow
wire (w07) and the 14-gauge blue wires (w08 and w113) from the light switch to the fuse block. Check the fuse.
See Test Procedure 2 – Fuse on page 12-13.
If the wires and fuse show continuity and the readings are still
incorrect, replace the switch.
See Light Switch Removal on page 14-10.
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
1130
Figure 12-36
Light Switch Test
TEST PROCEDURE 35 – Voltage at Headlight Socket
See General Warnings, Section 1, Page 1-2.
NOTE:
Keep the battery connected during this test procedure.
1.
Disable the vehicle.
See Disabling the Vehicle on page 1-3.
2.
Inspect the wires at the light bulb socket. Make sure the wires are securely fastened to the contacts inside
the socket.
3.
Remove the wire harness from the headlight bulb
4.
Use a multimeter set to 20 volts DC and place the black (–) probe into the black wire terminal of the wire harness.
Place the red (+) probe into the blue wire terminal.
5.
Pull the light switch to the ON position. If the multimeter indicates approximately 12 volts, replace the headlight
bulb.
6.
If there is no voltage reading at the wire harness, check the continuity of the 16-gauge blue wire (w01 and
w03) from the headlight to the light switch.
6.1.
Set the multimeter to 20 VDC.
6.2.
Use an alligator clip to attach the black (–) probe onto the negative (–) battery terminal and place the
red (+) probe into the blue wire terminal of the wire harness. If the multimeter reading is approximately
12 volts, the blue wire has continuity.
7.
Check the continuity of the 16-gauge black wire from the headlight to the ground terminal.
2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Page 12-43
Summary of Contents for Carryall 1500 2016
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