TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
Page 344 of 1205
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