TM 5-3800-205-23-1
TROUBLESHOOTING PROCEDURES - CONTINUED
0007 00
Table 5. Electrical System Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. Horn Will Not Sound When Button is
1. Check horn wiring harness for
If horn wiring harness checks
Pressed.
continuity and proper voltage
okay, go to test step 2.
of 24 Vdc.
2. Check horn solenoid and horn
a. If no continuity is indicated,
switch for continuity.
for solenoid, replace horn
solenoid (WP 0113 00).
b. If no continuity is indicated,
for switch, replace horn
switch (WP 0114 00).
1. Check lights for damage or
a. Replace burned out lamps/
9. Headlight(s)/Parking Light(s) Do Not
burned out lamps/bulbs.
bulbs. (WP 0050 00, WP
Operate When SER. DRIVE or PARK
Functions are Selected.
b. Replace any damaged light
assemblies (WP 0050 00,
c. If problem still exists, go to
test step 2.
a. Repair/replace
damaged
2. Check wiring harness(es) and
wires or connectors (WP
connectors for damage,
continuity and proper voltage
of 24 Vdc.
b. If problem still exists, go to
test step 3.
3. Check if light switch ground
Tighten ground cable if required.
cable is loose.
If problem still exists, go to test
step 4.
4. Check LO/HI beam relay for
a. Replace LO/HI beam relay
damage or shorts.
b. If problem still exists, go to
test step 5.
5. Check light switch
for
Replace light switch (WP 0044
damage and continuity.
a. Clean any mud or dirt from
10. High Beams Do Not Come On.
1. Check that no mud or dirt is
around switch.
packed
around
dimmer
switch on floor of cab.
b. If problem still exists, go to
test step 2.
