PS Magazine - TB 43-PS-603
PS, The Preventative Maintenance Monthly
ISSUE 603
FEBRUARY 2003
2.
Flip the two wires over
and reconnect them to the
glow plug resistor termi-
nal. 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
ceramic 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.
PS 603
FEB 03
4
PS 603
FEB 03
5
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 1 megohm, remove the
knurled nut that holds the
control box cover in place
and remove the cover.
3.
If resistance increases to
above 1 megohm and remains
steady at high impedance,
you’ve got a short.
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.
Unplug wires
from glow
plug resistor
Wrap wires
with heat
shrink tubing
Flip wires
over and
reconnect
Push wires
down
It’s going to
be a long winter
with my heater
problems!
maybe
it’s just
a short!
I’ll have
you checked
out and
fixed in
no time!
Performance problems with the MLRS’
Espar personnel heater could be the
result of a short between the control
box cover and the two wires that attach
to the glow plug resistor, mechanics.
Do not loosen glow
plug resistor screw
MLRS Carrier…
Use ohmmeter to
check for short
Chassis
Ground
Connector P4
Pin 1
Pin 1
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