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FUSE AND CIRCUIT BREAKER PANELS (CONTENTS)
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TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL DESCRIPTION All    chassis    incorporate    safety    devices    to    protect electrical wiring and equipment from short circuits or electrical overloads.    These  protective  devices  may  be  fuses,  circuit breakers or fusible links. Fuses Fuses are designed to pass a given amount of current. The current flow limit is indicated by the rating or "Size" of the fuse  (10  ampere,  14  ampere,  etc.).    Exceeding  this  limit  will cause the fuse to "blow" opening the circuit. After   the   cause   of   the   overload   is   determined   and corrected, a new fuse must be installed in the circuit.  Do not replace a "blown" fuse with a fuse of higher capacity.  To do so  may  result  in  damage  to  electrical  components  or  wiring. Where  fuse  failure  is  encountered,  correct  the  cause  of  the overload   and   install   a   new   fuse   of   the   originally   specified rating. Fuses   for   most   vehicle   wiring   circuits   are   grouped together  in  a  fuse  panel  (Figure  1).    Some  fuse  panels  have removable fuse terminals which can be replaced if Figure 1  Fuse Panel (Typical) damaged.        Most    fuse    panels    provide    space    to    install additional     fuse     terminals     if     needed     for     installation     of accessory circuits. Locations of fuse panels on various vehicle models are shown in this section. Circuit Breakers Circuit  breakers  are  designed  to  open  the  circuit  any time current demand exceeds the capacity of the breaker.  In the event of short or overload, the circuit breaker will open due to excessive heat developed by the higher amperage passing through  it.    When  the  heat  dissipates,  the  breaker  will  close allowing current flow again. If   the   cause   of   the   short   or   overload   has   not   been removed,  the  circuit  breaker  will  open  again  to  protect  the circuit.      The   current   flow   limit   is   indicated   by   the   rating (capacity)  of  the  circuit  breaker--15  amperes,  20  amperes, etc.    Do  not  replace  a  circuit  breaker  with  one  of  a  higher capacity. Circuit breakers for vehicle wiring circuits are generally grouped   together   in   a   circuit   breaker   panel.      Most   circuit breaker  panels  provide  space  for  installing  additional  circuit breakers if needed for installation of accessory circuits. Figure 2  Circuit Breaker Panel (Typical) Figure  2  illustrates  the  type  of  circuit  breakers  used  in heavy   duty   vehicles   equipped   with   circuit   breaker   panels. Figure 3 shows another type of CTS-2672Q  Page 3 PRINTED IN UNITED STATES OF AMERICA

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