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Home > Ordnance Documents and other related manuals > > Heater System.
Table 1: Lighting System Circuit Chart.
Figure 6. Beater 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
Step  2.
Disconnect  leads  33A,  27G,  and  58E  from  the  coolant
temperature gage.  Using the multimeter, check for battery voltage at
lead 27G with the rotary switch in the RUN position.  Then check for
continuity from lead 58E to ground and continuity from lead 33A at
the coolant temperature gage to lead 33B at the temperature sending
unit.
If all leads test correctly, replace the coolant temperature
gage, following the procedures contained in paragraph 4-13 of the TM.
If  any  leads  test  incorrectly,  repair  the  body  wiring  harness,
following the procedures contained in paragraph 4-62 of the TM.
If
the wiring harness cannot be repaired, notify IDS maintenance.
f.
Heater System.
While
reading
through
these
paragraphs
concerning troubleshooting this system, refer to figure 6  on the
following page.
Malfunction: HEATER MOTOR DOES NOT OPERATE OR ONLY OPERATES IN LO OR
HI.
NOTE
If  the  heater  motor
operates
in
high
or
low,
proceed to step 4.
Step 1.
Disconnect lead 57E at the heater motor.
Now, using a
multimeter,  check  for  continuity  between  57E  and  ground.
If
continuity is not present, repair the body wiring harness, following
the procedures contained in paragraph 4-62 of the TM.
If the body
wiring harness cannot be repaired, notify IDS maintenance.
Step 2.
Disconnect lead 400D from the heater motor.
Using the
multimeter, check for voltage with the heater motor switch in HI or
LO.
If voltage is present in both positions, replace the heater,
following the procedures in paragraph 10-59 of the TM.  If voltage is
present in only one of the positions, or is not present at all,
proceed to step 3.
20






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