Cadillac 60 Series 1963 Shop Manual page 326

ELECTRICAL SYSTEM
12-45
Low Note Horn
High Note Horn
Fig. 12-67 Horn Adjusting Screw
b. If the horn blows, the trouble is in the relay,
horn control, or wiring.
c. To determine whether the relay, horn con-
trol, or wiring is at fault, ground the " S " termi-
nal of the relay.
d. If the horn blows, the horn control or wiring
is at fault.
e. If the horn does not blow and the wiring be-
tween the battery and relay is not defective, con-
nect a voltmeter between the horn terminal and
the horn mounting nut.
f. Connect a jumper lead to the "H" and mid-
dle terminals of the relay and note the voltmeter
reading.
g. If no voltmeter reading is obtained, the
wiring between the relay and horn is open or the
horn is not grounded.
h. If the voltmeter reading is less than 7.0
volts, the trouble is due to high resistance con-
nections in the wiring or a faulty horn.
i. If the voltmeter reading is above 7.0 volts,
the trouble is due to a faulty horn. In this case,
the horn should be tested for current draw.
b. Horn Tone Poor—This condition
may result from:
1. Low available voltage at the horn.
2. Improper current setting.
3. Defects within the horn.
a. The horn should blow at any voltage above
7.0 volts. A poor tone may occur at operating
voltages below 11.0 volts.
b. If the horn has a weak or poor tone at an
operating voltage of 11.0 volts or higher, the horn
should be removed for a bench check.
c. Horn Operates Intermittently—
This condition may result from:
1. Loose or intermittent connections in the horn
relay or horn circuit.
2. Defective horn switch.
3. Defective horn relay.
4. Defects within the horn.
d. Checking Current Adjustment
1. Measure the current draw of the horn while
the horn is operating. The low note horn and the
high note horn should have a current draw of 7.0-
11.0 amperes at 12.0 volts.
e. Current Adjustment
1. Turn adjusting screw as shown in Fig. 12-67,
turning clockwise to decrease the current draw
and counterclockwise to increase the current
draw.
f. Cold Weather Adjustment
If horn fails to blow in cold weather, it is pos-
sible that current limit is set too low although
still within 7.0 - 11.0 ampere limit at 12.0 volts.
Turn adjusting screw 1/4 turn counterclockwise
(90°) to increase draw.
CAUTION: This adjustment should not be
made unless horn fails to blow. A current in-
crease on a properly operating horn can result
in complete failure of unit.
66. Horn Contact Assembly, Removal
and Installation (Fig. 12-68)
a. Removal
1. Pry off cap on steering wheel and horn con-
trol shroud.
2» Disconnect horn contact wire from top of
steering shaft.
3. Remove upper steering shaft nut.
4. Lift horn control shroud and switch assembly
from steering wheel.
5. Remove four screws from retainer on bottom
side of steering wheel shroud.
CAUTION: To facilitate disassembly, press
down on horn contact plate when removing
screws to relieve spring pressure and prevent
damage to retainer.