Pontiac 1957 Owner's Manual page 14

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short circuits the circuit breaker opens and closes intermittently,
thereby. reducing the current load sufficiently to protect the wiring
from damage. This action will continue until the cause is eliminated
and is usually noticed due to a
snapping
sound at approximately 3 to
5 second intervals. If you are driving at night, the action of the
Thermo Circuit Breaker will be noticed by the headlamps burning
intermittently.
When this happens, it is an indication of trouble
which should be corrected immediately.
The fuses that protect the main wiring and the
accessories are mounted in a fuse block on the
passenger
side
of the dash above and to the
left of the
steering
column. The fuse identifica-
tion is printed on the fuse block which facilitates
location and replacement of a blown fuse.
All fuses on the fuse block are
7~
ampere
with
the exception .of the fuse marked Rheo
Input which is 4 ampere and protects the head-
light switch rheostat and instrument panel light circuit. A spare
7~
ampere fuse is located in a clip at" the bottom of the fuse block.
With the following exceptions all accessories are protected by a
7~
ampere fuse.
The electric antenna uses a 14-ampere fuse mounted in a line holder
above the fuse
block.
Some electric clocks have a
l~-ampere
fuse
mounted on the back of the clock. The air conditioning unit has a
30-ampere fuse mounted in a line holder in front of the dash above
the steering gear. The electric windshield wiper motor has a 30-ampere
fuse in a line holder
on
the passenger side of the dash above the fuse
block. The cigar lighter has a special replaceable fuse or a reset type
circuit breaker
attached'
to the rear of the lighter socket.
Power windows and power seats are protected by a 40-ampere circuit
breaker located on the left side of the cowl above the kick pad.
[ 11]

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