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TM 9-2320-364-20-2
2-1142
2. HEADLIGHTS, CLEARANCE LIGHTS, HORN, WORK LIGHTS, DIMMER, OR
BEACON LIGHT DO NOT OPERATE (CONT).
22 to 28 vdc register on 24 vdc
voltmeter indicating ENGINE
switch is OK.
10 to 14 vdc register on 12 vdc
voltmeter indicating batteries
are OK.
Domelight operates indicating
10 to 14 vdc present on wire
1084 at BLACKOUT LIGHTS
switch.
Wire 1189 between splice at
BLACKOUT LIGHTS switch
and 24V relay R12 OK.
Wire 1872 between ENGINE
switch and IGNITION circuit
breaker CB10 faulty.
IGNITION circuit breaker CB10
faulty.
Wire 1872 between IGNITION
circuit breaker CB10 and 24V
relay R12 faulty.
Wire 1435 between 24V relay
R12 and known good
ground faulty.
24V relay R12 faulty.
Wires 1430 faulty.
Wire 1189 between 24V relay
R12 and magnetic switch
R28 faulty.
Wire 1435 between magnetic
switch R28 and known good
ground faulty.
Wire 1435 between magnetic
switch R28 and rectifier M52
faulty.
Rectifier M52 faulty.
Magnetic switch R28 faulty.
Wire 1175 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
YES
NO
Go to Step 3 of this
Fault.
2.
Are 22 to 28 vdc measured on
wire 1872 at 24V relay R12,
terminal 86 with ENGINE
switch turned ON?
Go to Step 5 of this
Fault.
If 22 to 28 vdc are not present,
wire 1872 between IGNITION
circuit breaker CB10 and 24V
relay R12 is faulty.
WARNING
Read WARNING
on Page 2-1143
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