Change 1 2-318.7
Dead glowplugs draw virtually no current, but
other parts of the vehicle are drawing some
current, up to 8 amps. If any glowplugs are
drawing any current, then the distribution box
and glowplug circuit is probably OK.
For a good description of how glowplugs cycle
and how to check for proper cycling, refer to
Disconnect ALL the glowplugs.
Disconnect the negative battery cable. Disconnect the
distribution box connector harness from the distribution box.
Reconnect the negative battery cable. Measure the
resistance between pin D in the engine connector harness
of the distribution box and ground. There should NOT be
continuity (resistance reading off-the-scale). If there is
continuity, repair or replace the harness.
Repeat the following for each glowplug:
Reconnect the wiring harness to the glowplug while you
repeat the resistance measurement described in step 2.
When you reconnect the wire to the glowplug, the
resistance should drop to between 1 and 2 ohms
(glowplugs are typically 1.6 ohms).
If step a passed;
disconnect the glowplug again, making sure the resistance
goes off-scale again. Repeat step a for the next glowplug.
If step a failed;
then either the glowplug or its wire is no good. Take the
wire off the glowplug again and measure the resistance
from the glowplug to the engine block. If the resistance is
1 - 2 ohms, then the cable is no good, otherwise replace
the glowplug and check the cable for continuity, just to be
If most or all of the glowplugs are bad, you may
also have a problem with the distribution box or
the glowplug controller which caused them to
go bad (usually they burn out from being on too
long or not turning off at all). After replacing
the bad glowplugs, rerun the glowplugs test
chain paying special attention to the glowplugs
cycling, especially that they turn OFF when
STE/ICE-R TEST 80
1. Start Test 80, battery current.
2. Displayed reading is in amps. The reading will be
greater then 30 amps, depending on how many
accessories you have on.
1. Set the voltmeter to a DC volts scale of about 1 volt.
2. Connect the BLACK lead to the battery side of the
current shunt and the RED lead to the other end of the
3. Current shunt voltage is proportional to battery
current, 100 millivolts = 1000 amps. To get current,
multiply millivolts x 10.
CHECKING GLOWPLUGS & THEIR WIRES
Replace glowplugs, wires, or harness, refer to
Reconnect the distribution box and all wires.
Disconnect negative battery cable before
disconnecting and reconnecting distribution
There is battery voltage at the distribution box at
all times. Failure to disconnect battery cable will
result in damage to equipment or injury to