CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
POWERPLANT WARNING HORN-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.
M Reconnect bulkhead to engine bracket and rear fuel
tank transmitter wiring harness to engine
disconnect. Remove powerplant (see paragraph
3-1). Disconnect wire 509 from engine high oil
temperature switch. Place red lead of multimeter
in wire 509 and black lead to ground. Turn MASTER
switch on, start engine, set to idle, and check for
voltage. Turn engine and MASTER switch OFF. If
voltage is present, replace engine high oil
temperature switch (see paragraph 6-22). If
voltage is not present, go to step N.
N Disconnect wire 509 from engine low oil pressure
switch. Place red lead of multimeter in wire 509
and black lead to ground. Turn MASTER switch on,
start engine, set to idle, and check for voltage. Turn
engine and MASTER switch OFF. If voltage is
present, replace engine low oil pressure switch (see
paragraph 6-22). If voltage is not present, go to
step O.
O Disconnect wire 509 from transmission high oil
temperature switch. Place red lead of multimeter
in wire 509 and black lead to ground. Turn MASTER
switch on, start engine, set to idle, and check for
voltage. Turn engine and MASTER switch OFF. If
voltage is present, replace transmission high oil
temperature switch (see paragraph 6-19). If
voltage is not present at any of the switches,
repair/replace wire 509 of engine wiring harness
(see paragraph 6-58 for dual voltage; 6-59 for single
voltage).
2-218
