TM 9-2320-387-24-l
2-37. GLOW PLUGS CIRCUIT TESTS
These tests of the glow plugs circuit can be run any time you think there may be a
problem with the glow plugs, or if you were sent here from another test.
If you were sent from another test, be sure to mark where you came from so you will be
able to return.
If you are running this test because the engine is hard to start when cold, remember that
there’is also a cold-start advance circuit (part of the fuel system) which is not checked
here.
For any starting problem, we recommend running the STARTABILITY test chain just
to be sure you don’t miss anything.
At the bottom of this page is a simplified block diagram which shows how the different
parts of the glow plug circuit depend on each other and on other engine circuits.
Refer to fold-out page FP-17 and leave it open for reference while performing these
tests. The fold-out diagram is arranged to allow you to follow the diagnostic logic and
understand what you are testing, when, and why.
BAllERY
t
c
GLOW PLUG
CONTROLLER
4
v
b
GLOW PLUGS
ALTERNATORA.C.LEAD
~-4
.
1
1
1
--i
PROTECTIVE
ALTERNATOR
CONTROL
BOX
INSTRUMENT POWER----------t
(1
GROUND 4
GLOW PLUGS CIRCUIT SlMPLlFlED BLOCK DIAGRAM
2-289
