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).
B. 1. Install light bulb in steering shaft MASTER
warning light assembly, and light bulb and
lens in driver’s portable instrument panel
MASTER warning light indicator.
2. Disconnect wire harness 12260287 from
portable instrument panel harness and from
driver’s bulkhead.
3. Place one lead of multimeter on socket H
of harness 12260287 at portable instrument
panel connector and place the other lead at
pin N of harness 12260287 at driver’s bulk-
head connector.
4. Check for continuity.
Is continuity indicated?
Repair 509 or replace wire harness
12260287 (para 7-56) Verify problem
C. 1. Reconnect harness 12260287 at portable
instrument panel,
2. Disconnect harness 12268418-1 from
engine disconnect bracket.
3. Place one lead of multimeter on socket N
of harness 12268418-1 at engine bulkhead
connector, and place the other lead of muti-
meter on socket H of harness 12268418-1 at
engine disconnect bracket connector.
4. Check harness 12268418-1 for continu-
ity.
Is continuity indicated?
Continued on next page
2-145
