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. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
Operate - Continued
resistance between cab upper
Proceed to Test Step 5.
wiring harness connector R-C1
Resistance 5.0 Ohms or Greater -
(WP 0009, Figure 33) terminal 1
Replace cab upper wiring harness
and 15. Resistance should be
(WP 0265).
less than 5.0 ohms.
Install fuse F31 (TM 5-3805-293-10).
Install dome light bulb and lens cover
(WP 0277).
Proceed to step 4.
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 5. Check for Shorted Cab
Upper Wiring Harness.
1. Remove jumper wire between R-
C36 (WP 0009, Figure 282) termi-
nals B and C.
2. Using digital multimeter, measure
Continuity - Replace cab upper wir-
for continuity between cab upper
ing harness (WP 0265).
wiring harness connector R-C1
Install fuse F31 (TM 5-3805-293-10).
(WP 0009, Figure 33) terminal 1
Install dome light bulb and lens cover
and 15. There should be no conti-
(WP 0277).
nuity.
Proceed to step 3.
No Continuity - Replace cab lower
wiring harness (WP 0266).
Install fuse F31 (TM 5-3805-293-10).
Install dome light bulb and lens cover
(WP 0277).
Connect the cab upper wiring harness
connector R-C36 (WP 0009, Figure
282) to dome light (WP 0009, Figure
283).
Proceed to step 3.
3. Turn dome light switch on and
Dome Light Does Not Operate -
verify dome light operates.
Repeat troubleshooting from the
beginning.
Dome Light Operates - Trouble-
shooting complete.
0023-4