PS Magazine - TB 43-PS-636
PS, The Preventative Maintenance Monthly
ISSUE 636
NOVEMBER 2005
PS 636
NOV 05
5
What To Do
To fix the short follow these steps:
1.
Unplug the two wires from the connector on the glow plug resistor. Wrap each of
the wires and their connectors with heat shrink tubing, NSN 5970-00-815-1295.
Then use a heat gun or blow dryer to shrink the tubing in place.
2.
Flip the two wires over
and reconnect them to the
glow plug resistor terminal.
That puts a little more
space between the wires
and the control box cover.
It’s very important to
avoid loosening or remov-
ing the glow plug resistor
screw when flipping the
wires. The screw goes all
the way through the ceram-
ic insulator and is used to
hold several other parts in
place. Loosening the screw
could result in a short to
ground.
3.
Push down on the wires
to provide as much space
as possible between them
and the control box cover.
Reinstall the cover.
MLRS Carrier…
Heater Comes Up Short
How to Tell
If you suspect a short, use an ohmmeter to test for it like this:
1.
Connect the positive lead
to Pin 1 of the P4 terminal
and the negative lead to
ground on the heater chassis.
2.
If the ohmmeter reads less
than one megohm, remove the
knurled nut that holds the
control box cover in place and
remove the cover.
3.
If resistance increases to
above one megohm and
remains steady at high imped-
ance, you’ve got a short.
the sh-short in
muh-my heater is
guh-going to make
for a long wuh-
winter!
not to
worry! I can
make
short
work
of
that short!
Use ohmmeter to
check for short
Chassis
Ground
Connector P4
Pin 1
Pin 1
Connector P4
Unplug wires
from glow
plug resistor
Wrap wires
with heat
shrink tubing
Flip wires over
and reconnect
Push wires down
Do not loosen glow
plug resistor screw
Got a
performance
problem with the
Espar personnel
heater on an
MLRS, mechanics?
it could be the
result of a
short
between the control
box cover and the
two wires that
attach to the glow
plug resistor.
636.04-05(C).qxd
9/30/05
10:19 AM
Page 1
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