TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 1/TASK 2
Disconnect the negative battery cable from the battery and
disconnect the protective control box cannon plugs from the
protective control box. Reconnect the negative battery cable to the
Now check pin E of the engine wiring harness cannon plug
for battery voltage.
If voltage is present, check for continuity
from pin G on the protective control box wiring harness cannon plug
to lead 11A of the rotary switch. If continuity is present, replace
the protective control box following the procedures in paragraph 4-5
of the TM.
If continuity is not present, repair the body wiring
harness following the procedures in paragraph 4-62 of the TM. If the
wiring harness cannot be repaired, notify IDS/IGS maintenance.
While reading through these paragraphs
concerning troubleshooting the lighting system, refer to figure 4 on
the following page.
Troubleshooting the Malfunction:
LAMPS WILL NOT LIGHT.
Step 1. Begin by positioning the light switch to the circuit being
Now check for battery voltage at the sockets.
voltage is present, replace the bulb with a bulb known to operate.
If the bulb does not light, check for corroded connections, loose
lamp sockets, or damaged wire terminals.
Repair or replace any
Disconnect the body wiring harness from the light switch.
Using a multimeter, check for battery voltage at terminal F in the
body wiring harness.
If battery voltage is not present, repair the
body wiring harness following the procedures in paragraph 4-62 of the
If the wiring harness cannot be repaired, notify IDS/IGS
Working from the circuit chart (table 1, on page 53),
connect a jumper wire from terminal F to the terminal of the circuit
If the lamps light with the jumper wire connected,
replace the main light switch using the procedures contained in
paragraph 4-45 of the TM.
If the lamps do not light, repair or