TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Dome Light Does not
3. With the dome light switch on, use
Resistance Less Than 5.0 Ohms -
Operate - Continued
a digital multimeter to measure
Proceed to Test Step 3.
resistance between dome light
Resistance 5.0 Ohms or Greater -
(WP 0009, Figure 283) terminals
Replace dome light (WP 0277).
B and C. Resistance should be
Proceed to step 5.
less than 5.0 ohms.
4. Turn dome light switch on (TM 5-
Dome Light Does Not Operate -
3805-293-10) and verify dome
Repeat troubleshooting from the
light operates.
beginning.
Dome Light Operates - Trouble-
shooting complete.
Test Step 3. Check for Bad Fuse.
1. Remove fuse F31 from cab fuse
panel (TM 5-3805-293-10).
2. Visually inspect fuse F31 for open
Resistance Less Than 5.0 Ohms -
or use a digital multimeter to mea-
Proceed to Test Step 4.
sure resistance between the ter-
Fuse Open or Resistance 5.0 Ohms
minals of fuse F31. Resistance
or Greater - Replace fuse F31.
should be less than 5.0 ohms.
Connect the cab upper wiring harness
connector R-C36 (WP 0009, Figure
282) to dome light (WP 0009, Figure
283).
Install dome light bulb and lens cover
(WP 0277).
Proceed to step 3.
3. Turn dome light switch on (TM 5-
Dome Light Does Not Operate -
3805-293-10) and verify dome
Repeat troubleshooting from the
light operates.
beginning.
Dome Light Operates - Trouble-
shooting complete.
Test Step 4. Check for Open Circuit
In Cab Upper Wiring Harness.
1. Disconnect the cab lower wiring
harness connector P-C3 (WP
0009, Figure 34) from cab upper
wiring harness connector R-C1
(WP 0009, Figure 33).
2. Connect jumper wire between R-
C36 (WP 0009, Figure 282) termi-
nals B and C.
0023-3
