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Table 1. Cab Electrical Troubleshooting Procedures - Continued.
Table 1. Cab Electrical Troubleshooting Procedures - Continued.

Maintenance Manual For Motorized Road Grader Model 120M - 2
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TM 5-3805-293-23-2
0023
Table 1. Cab Electrical Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. One or Both Headlights
3. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
Do Not Operate in High
resistance between rear chassis
Proceed to Test Step 12.
Beam - Continued
wiring harness connector FA-C41
Resistance 5.0 Ohms or Greater -
(WP 0009, Figure 21) terminal 11
Proceed to Test Step 11.
and machine ground. Resistance
should be less than 5.0 ohms.
Test Step 11. Check for Open Cab
Lower Wiring Harness.
1. Disconnect the rear chassis wir-
ing harness connector FA-C35
(WP 0009, Figure 15) from cab
lower wiring harness connector P-
C70 (WP 0009, Figure 16) (WP
0265).
2. Using digital multimeter, measure
Resistance Less Than 5.0 Ohms -
resistance between cab lower wir-
Replace rear chassis wiring harness
ing harness connector P-C70
(WP 0188).
(WP 0009, Figure 16) terminal 9
Remove jumper wire from head lamp
and machine ground. Resistance
relay socket (WP 0009, Figure 299)
should be less than 5.0 ohms.
terminals E14 and E13.
Install headlamp relay (WP 0009, Fig-
ure 298) to head lamp relay socket
(WP 0009, Figure 299).
Connect the control indicator harness
connector PE-C11 (WP 0009, Figure
287) to cab lower wiring harness con-
nector P-C11 (WP 0009, Figure 286)
(WP 0283).
Connect the connector AZ-C1 (WP
0009, Figure 387) to left headlight and
install headlight assembly (WP 0197).
Proceed to step 3.
0023-25


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