e<:heck the rear brake light switch in the same way
that the front brake light switch was inspected. If
there is no continuity whenever the rear brake pedal
if depressed, replace the switch.
A. Rear Brake Light Switch
The horn circuit and construction are shown in
When the horn button is pressed (with the
the horn is grounded to complete
the horn circuit. Current then flows through the horn
contacts and horn
magnetizing the iron core. The
magnetized iron core pulls on the armature and
the movement of which pushes open
the contacts, interrupting the current flow
core now loses its
the armature and
phragm assembly springs back
This cycle repeats until the horn
button is released. Since each cycle takes
a fractu re
of a second, the diaphragm moves fast enough to
The horn contacts wear down after long use and may
need to be adjusted from time to time. When satisfactory
horn performance cannot be obtained by adjustment,
check the horn and the rest of the horn circuit.
horn adjustment alone cannot the trouble and the rest
of the electrical system is functioning properly, the
horn must be replaced.
It cannot be disassembled.
NOTE: Two horns are installed
connect the horn you will not adjust so that you can
determine the change of the horn sound during adjust-
the black/white horn lead, and connect an
ammeter in series to the horn circuit. The + ammeter
lead goes to the horn terminal and the
to the black/white lead.
DC 20A Range
loosen the adjusting screw locknut.
on the ignition key
and keep the horn button
pressed while turning the horn adjusting screw. Adjust
for the best hom sound while keeping the current
under 2.5 amperes.
: , ":::.:r;o:
current with the possibility of burning
the hom coil.
B. Adjusting Screw
the adjusting screw locknut.
The horn will not sound properly if it is mount-
ed incorrectly or if any cable or other part is touching it.