TM 9-2320-280-20-1
2-31.1. GLOWPLUGS CIRCUIT TESTS (DISTRIBUTION BOX)
These tests of the Glowplugs Circuit can be run anytime you think there may be a
problem with the glowplugs, 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 glowplug circuit depend on each other and on other engine circuits.
ALTERNATOR A.C.
LEAD
INSTRUMENT POWER
GLOWPLUGS
DISTRIBUTION BOX
WAIT-TO-START
LAMP
GROUND
GLOWPLUGS CIRCUIT SIMPLIFIED BLOCK DIAGRAM
FOR DISTRIBUTION BOX
BATTERY
ALTERNATOR
Change 1 2-318.1
