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TM 9-2320-285-24-1
2-19.
INSTRUMENT PANEL TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. WATER LEVEL WARNING LIGHT AND BELL NOT OPERATING PROPERLY
Step 1.
Disconnect oil pressure sensor electrical lead (para 2-32a).
With engine stopped, turn key switch to on position.
WATER LEVEL warning lamp should light and warning bell should sound.
a. If lamp does not light, go to step 2 below.
b. If bell does not sound, go to step 3 below.
c. If lamp lights, bell sounds, and OIL PRESSURE or WATER TEMP warning lamps light, go to
step 4 below.
Step 2.
Check for continuity of WATER LEVEL warning light bulb.
a. If bulb is defective, replace (para 2-26b(4)).
b. If bulb is not defective, repair socket and wiring as required (para 2-26b(4)).
Step 3.
Disconnect warning bell electrical leads (para 2-26c(1)).
Connect 12 Vdc power source to bell.
Bell should sound.
a. If bell does not sound, replace (para 2-26c(1)).
b. If bell sounds, go to step 4 below.
Step 4.
Check continuity of diodes (para 2-35f) and brown/red electrical lead connecting diodes and bell.
a. If correct continuity is not obtained, replace diodes (para 2-35f) or repair wiring (para 2-35c(2)).
b. If correct continuity is obtained, go to step 5 below.
Step 5.
With engine stopped, turn key switch to on position.
Disconnect oil pressure sensor electrical lead (para 2-32a).
Use a voltmeter to check for 12 Vdc at water level sensor blue/brown electrical lead.
a. If voltmeter indicates 12 Vdc, repair or replace electrical lead (para 2-32a).
b. If voltmeter indicates zero, go to step 6 below.
2-172
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