Change 1 2-311
Ensure that alternator "AC" tap is functioning
correctly by measuring DC volts at wire 2A.
Reading should be between 9-16 Vdc. If this
votage is not present, glowplug system will never
Refer to the functional flow schematic. If the glow-
plug controller is shorted (continuity from pin 6 to
pin 3), the glowplug power relay will always be
energized and the glowplugs will always be
Since the glowplugs draw current
without the glowplug controller
connected, there must be a short in
the harness or a stuck relay in the
protective control box (PCB). If
there were a short in the harness
directly to the glowplugs, the
glowplugs would have burned out
long ago and you wouldn't be here.
The only other short in the harness
that would make the glowplugs turn
on without the glowplug controller
installed would show up as battery
voltage at pin 6 of the controller's
1. Set the voltmeter to a DC volts scale of about 1
2. Connect the BLACK lead to the battery side of
the current shunt and the RED lead to the other
end of the current shunt.
3. Current shunt voltage is proportional to battery
current, 100 millivolts = 1000 amps. To get current,
multiply millivolts x 10.
STE/ICE-R TEST 80
1. Start Test 80, battery current.
2. Displayed reading is in amps. The reading
will be greater than 30 amps, depending on
how many accessories you have on.
1. Set the voltmeter to a DC volts scale of at least
2. Connect the RED lead to positive and the
BLACK lead to negative.
3. Be sure to read the correct scale.
Check the end of the harness at the protective control
box, glowplugs, etc. for shorts. Repair whatever you
can. If you don't see anything wrong, the short must
be in the main body of the harness, which means that
you have to replace the harness.
For repair or replacement of wiring, refer to (para. 4-85).
Replace PCB, refer to (para. 4-5).
0-45 DC VOLTS
STE/ICE-R TEST 89
1. Connect RED clip to the indicated test point,
BLACK clip to negative or ground.
2. Start Test 89, DC volts.
3. Displayed reading is in volts.
Disconnect negative battery cable before discon-
necting and reconnecting protective control box.
There is battery voltage at the PCB at all times. Failure
to disconnect battery cable will result in damage to
equipment or injury to personnel.