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Home > Ordnance Documents and other related manuals > > Trailer Connection System.
Windshield Wiper/Washer System.
Figure 8. Trailer Connection System Schematic

Troubleshoot Electrical System ( Glow Plugs And cold Start Advance on An
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TROUBLESHOOTING THE M998 ELECT SYST. - OD1617 - LESSON 1/TASK 1
FIGURE 7.
WINDSHIELD WIPER/WASHER SYSTEM
SCHEMATIC.
h.
Trailer  Connection  System.
While  reading  through  these
paragraphs concerning troubleshooting the trailer connection system,
refer to figure 3 on the following page.
Malfunction:
ONE  OR  MORE  TRAILER
LIGHTS
INOPERATIVE
(VEHICLE
LIGHTING SYSTEM FUNCTIONS NORMALLY).
Step 1.  Begin by positioning the light switch to the circuit being
tested.
Now check for battery voltage at the sockets.
If battery
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
damaged components.
Step 2.  Using a multimeter, check for continuity between pins D and
L of the trailer receptacle to the frame.
If continuity is not
present, repair the body wiring harness, following the procedures
contained in paragraph 4-62 of the TM.  However, if the body wiring
harness cannot be repaired, notify IDS maintenance.
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