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I""'
p ART 15-1-
GENERAL
LIGHTING SYSTEM, HORNS INSTRUMENTS SERVICE
15-3
INS TRUMENT TROUBLE
DIAGNOSIS GUIDE
T EMPERATURE GAUGE
E RRA TIC OR INOPERATIVE
F
E
UEL, TEMPERATURE, AND
OIL PRESSURE GAUGES
RRATIC
1. Loose terminals
on
temp gauge.
l. Defective temperature gauge.
3.
Loose
or broken wire from the
temperature
sending unit to the tern-
1. Loose or
corroded
constant
voltage
regulator ground.
l. Defective constant voltage reg-
ulator.
HORN TROUBLE DIAGNOSIS
GUIDE
HORNS DO NOT SOUND
ONE HORN FAILS
0 OPERATE
T
H ORNS OPERATE
ONTINUOUSL Y
c
1. Loose connections at horn but-
ton·
con
tact.
2.
Open
wire (blue/red)
from
horn to horn
button.
3. Open wire
(green) from
fuse
1. Broken or loose wire to the
horn (blue/red).
1.
Horn button defective.
T URN INDICATOR TROUBLE
DIAGNOSIS GUIDE
T URN INDICATOR LIGHTS
NOPERATIVE
I
T URN INDICATOR LIGHTS
OPERATE INCORRECTLY
T URN INDICATOR
ANCELS IMPROPERLY
c
1. Burned out bulbs, or loose
sockets.
l.
Loose
or broken wire from
ignition switch
to flasher.
3. Defective flasher.
1.
Burned out bulb.
l.
Loose,
broken, or shorted wires
from switch
to lights.
1. Cam improperly positioned on
steering wheel
hub.
WINDSHIELD WIPER TROUBLE
DIAGNOSIS GUIDE
I NOPERATIVE OR SLOW
WIPER
1. Binding linkage.
1.
Defective switch.
3. Defective wiper motor
perature gauge.
4. Defective temperature sending
unit.
5. Defective constant voltage
reg-
ulator.
3 Broken
or
loose
conductor from
or to
the
constant
voltage
regulator.
4. Defective ignition switch.
box
to
horn button.
4. Horns defective or out of ad-
justment.
5.
Fuse
burned
out.
l. Horn defective or out of ad-
justment.
4. Loose or broken wire from
flasher to turn
indicator
switch.
5. Defective turn indicator switch.
6. Broken, shorted,
or
loose wires
from switch
to lights.
3. Defective indicator switch.
4. Defective flasher.
l. Coil spring on switch plate as-
sembly
loose or weak.
4. Defective wiring or blown fuse.
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