TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
Test Procedures
12
9.
If the voltage reading is approximately 12 VDC with the key switch in the OFF position, check the key switch for
proper wiring and function.
See Test Procedure 5 – Key Switch (ON Position) on page 12-16.
10.
If the voltage reading obtained in step 8 is correct, check the filament of the warning light.
10.1. Set the multimeter to 200 ohms.
10.2. Check for continuity between the warning light terminals.
10.3. The reading should indicate continuity. If not, replace the coolant temperature warning light.
11.
If the voltage reading obtained in step 8 is not approximately 12 VDC with the key switch in the ON position,
check the following:
– 30-amp fuse (on wire w125).
See Test Procedure 2 – Fuse on page 12-13.
– Key switch.
See Test Procedure 5 – Key Switch (ON Position) on page 12-16.
– Connections and wire continuity for wires w117, w45, w29, w37, w24, w125, and w126.
See Test Procedure
18 – Wire Continuity on page 12-31.
TEST PROCEDURE 24 – Glow Plug Circuit
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.
Set a multimeter to 20 VDC.
3.
Place the red (+) probe on the wire terminal where the 12-gauge blue wire (w137) connects to the glow plug
and glow plug buss bar
4.
Place the black (–) probe on the frame or engine block (ground).
5.
The multimeter should indicate 0 VDC with the key in the OFF position.
6.
Monitor the multimeter and turn the key to the PREHEAT position. Hold it for 5 seconds. The multimeter should
indicate 11 to 12 VDC.
V
2124
Figure 12-30
Glow Plug Circuit Test
7.
If the readings in the previous two steps are incorrect, check the following:
– 30-amp fuse (on wire w125).
See Test Procedure 2 – Fuse on page 12-13.
– Key Switch.
See Test Procedure 6 – Key Switch (Glow Plug Circuit) on page 12-17.
2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Page 12-35
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