TM 9-2350-287-20-1
2-19. TROUBLESHOOTING CHART (continued).
h. LIGHTS (continued).
(3) MASTER WARNING LIGHT FAILS TO OPERATE
WHEN ENGINE OVERHEATS. All other lights
operate (continued).
Repair wire 509 or replace wire harness
12268418-1 (para 7-44). verify
problem is solved.
D. 1. Reconnect wire harness 12260287 at
driver’s bulkhead.
2. Disconnect wire 509A from engine cool-
ant temperature switch.
3. Place one lead of multimeter on pin H of
wire harness 12268308 and other lead in
wire 509A.
4. Check for continuity.
Is continuity indicated?
Replace engine coolant high
temperature switch (para 7-37).
Verify problem is solved.
END OF TASK
2-146
Repair wire 509 or replace wire
harness 12268308 (para 7-50)
Verify problem is solved.
