HORN INOPERATIVE (WARNING DEVICE DOES NOT SOUND WHEN TRANSMISSION IS LEFT IN GEAR) cont'd

TM 9-2320-27020-1

TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

36. HORN INOPERATIVE (WARNING DEVICE DOES NOT SOUND WHEN TRANSMISSION IS LEFT IN

GEAR) - CONTINUED.

Step 5.

Put main transmission in fifth gear(D), ignition switch in ON position, and open

door on driver's side. Go to auxiliary transmission under truck cab. Using mul-

timeter set at 30 vdc, put red probe on wire no. 154 (1) and black probe to good

ground.

If meter reads no voltage, notify direct support maintenance.

Step 6.

At fifth gear switch on front of shift console, using multimeter set at 30 vdc,

put red probe on wire no. 154 (1) and black probe to good ground.

a. If meter reads voltage, replace switch (page 4-509).

b. If meter reads no voltage, notify direct support maintenance.

If horn is still inoperative, notify direct support maintenance.

TA239689

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