TM 5-3805-298-23-2
0141
Table 1. Horn Does Not Operate - Continued.
0141
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Horn Does Not Operate -
6. Listen for operation of horn
Horn Operates Swap blackout horn
Continued
(TM 5-3805-298-10).
relay back to blackout headlight relay
position and replace blackout horn relay
(TM 5-3805-298-10).
Proceed to Test Step 24.
Horn Does Not Does Not Operate
Proceed to Test Step 8.
Test Step 8. Test for Voltage at
Blackout Horn Relay.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
2. Remove blackout horn relay from
fuse panel (TM 5-3805-298-10).
3. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-298-10).
4. Using digital multimeter
Voltage 18 to 26 V Proceed to step 5.
(WP 0174), test for voltage
Voltage Less Than 18 V Replace
between connector C-C31
lower cab wiring harness (WP 0291).
(WP 0012, Figure 74) terminal D3
Proceed to Test Step 24.
and D2.
5. Using digital multimeter
Voltage 18 to 26 V Replace lower cab
(WP 0174), test for voltage
wiring harness (WP 0291).
between connector C-C31
Proceed to Test Step 24.
(WP 0012, Figure 74) terminal D1
Voltage Less Than 18 V Proceed to
and D2.
Test Step 9.
Test Step 9. Test for Faulty Military
Light Switch.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
2. Remove military light switch
(WP 0257).
3. Using digital multimeter
Resistance 5.0 Ohms or Less
(WP 0174), measure resistance
Proceed to Test Step 10.
between military light switch
Resistance Greater Than 5.0 Ohms
(WP 0012, Figure 142) terminal J
Replace military light switch (WP 0257).
and terminal F.
Proceed to Test Step 24.
0141-5
