TM 1-1740-221-13&P&P
FIELD MAINTENANCE
ELECTRIC PANEL (DASH)
INITIAL SETUP:
Test Equipment
References
Multimeter (WP 0157, Item 14)
Tools and Special Tools
Equipment Condition
Fuse Puller Tool (WP 0157, Item 9)
General Mechanic Tool Box (WP 0157, Item 24)
Engine Shut Down
Personnel Required
91B, Light Wheel Vehicle Mechanic
INSPECTION
Visually inspect components and wiring for corrosion, damaged connectors and sockets, exposed wiring, and
faulty mounting.
END OF TASK
TEST
Relay s CRR and CRS (Figure 1, Item 10 and 13)
NOTE
Relay test pins are identiied on the bottom of the relay.
1.
Remove appropriate relay this work package.
2.
Ohms test relay coil from pins 85 to 86.
3.
Resistance measured should be 85 ohms nominally.
4.
Ohms test relay switch from pins 30 to 87A for continuity.
5.
Replace relay if either ohms test fails.
Accessory Relay (CRA)
1. Remove wiring from accessory relay this work package.
2. Ohms test across relay coil terminals (Figure 1, Item 16).
3. Resistance measured should be 15 ohms nominally.
4. Ohms test across relay terminals (Figure 1, Item 1 and 6).
5. Open circuit or no continuity should exist.
6. Replace relay if either ohms test fails.
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