CHAPTER 2; VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
ENGINE MANIFOLD PREHEATER SYSTEM-Continued
WARNING
Remove all jewelry such as rings, dog tags,
bracelets, etc. If jewelry contacts a metal
surface a direct short may result in instant
heating of tools, damage to equipment, and
injury or death to personnel.
I Remove engine deck (see paragraph 9-51). Reconnect
wire 486 at connector near bulkhead disconnect.
Disconnect bulkhead to engine bracket and rear fuel tank
transmitter wiring harness from engine disconnect. Place
red lead of multimeter in socket A of wire 486 and black
lead to ground. Turn MASTER switch ON, push START
and manifold preheat switches, and check for voltage.
Turn MASTER, START and manifold preheat switches
OFF. If voltage is present, go to step J. If voltage is not
present repair/replace wire 486 of bulkhead to engine
bracket and rear fuel tank transmitter wiring harness (see
paragraph 6-73 for dual voltage; 6-74 for single voltage).
NOTE
Steps J through N are the same for both left
and right preheaters and fuel solenoids.
Perform J through N as necessary for each
side.
J Remove powerplant (see paragraph 3-1). Reconnect
bulkhead to engine bracket and rear fuel tank transmitter
wiring harness to engine disconnect. Disconnect engine
wiring harness from manifold preheater ignition unit.
Place red lead of multimeter in socket A of wire 486 and
black lead to ground. Turn MASTER switch on, push
START and manifold preheat switches, and check for
voltage. Turn MASTER, START, and manifold preheat
switches OFF. If voltage is present, go to step K. If
voltage is not present, repair/replace wire 486 of engine
wiring (see paragraph 6-58 for dual voltage; 6-59 for
single voltage).
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