CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
MASTER WARNING LIGHT--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.
K Place a jumper wire from wire 27G to terminal of master
warning light. 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
lamp (see paragraph 6- 8). If voltage is not present, go
to step L.
L Reconnect connector to master warning light. Disconnect
gage panel to bulkhead wiring harness from gage panel.
Place a jumper wire from pin K to socket K. Place red
lead of multimeter in pin A of 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, repair/replace wire
509 of gage panel wiring harness (see paragraph 6-44).
If voltage is not present, reconnect gage panel to
bulkhead wiring harness and go to step M.
M Open air inlet doors. Disconnect bulkhead to engine
bracket and rear fuel tank transmitter wiring harness from
bulkhead disconnect. Place red lead of multimeter in
socket H of 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, go to step N. If voltage is not present,
repair/replace wire 509 of gage panel to bulkhead wiring
harness from gage panel to bulkhead (see paragraph 645
for dual voltage; 6-46 for single voltage).
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