HORN AND BACK-UP ALARM TROUBLESHOOTING AND MAINTENANCE PROCEDURES.
TEST OR INSPECTION
HORN FAILS TO OPERATE.
If the horn assembly is damaged or defective--replace. Refer to paragraph 7-102.
Step 4. Test the continuity of the horn switch (Figure 7-148). Connect one multimeter lead to the back of switch
and one to ground.
If the multimeter needle does not move, the circuit does not have continuity. Replace horn switch. Refer to
Step 5. Check the horn wiring harness.
If the horn wiring harness is cracked, broken or corroded--repair. Refer to paragraph 7-116. If replacement is
necessary, refer to paragraph 7-131.
BACK-UP ALARM FAILS TO OPERATE WITH TRANSMISSION IN REVERSE.
Step 1. Turn on service lights (refer to TM 5-3805-261-10).
Step 2. Check circuit breaker number 60A.
Reset circuit breaker.
Step 3. Check fuse number 15A.
If fuse is blown--replace. Refer to paragraph 7-63.