There is no circuit breaker in original cars in main power, except......."some years" etc have
breaker built into the headlight switch for those
built into the wiper switch I think only earlier years
The main feed through the bulkhead power is "somewhat" protectected by one time fuse links out in the engine bay
If you can, post a reference to what you are seeing. What diagram are you reading? Generally factory shop manuals are superior.
MyMopar has free service manuals you can download
http://www.mymopar.com/index.php?pid=31
Also on that site are wiring diagrams SOME of those are aftermarket and not always complete
http://www.mymopar.com/index.php?pid=18
Please be certain to read this MAD article. Even if you don't do the modification, this article points out the problems with wiring, mainly, bulkhead connector terminals, ammeter, etc, and in some cases the ignition switch for some problems
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
The diagram they post there on that page is an excellent simplified view of the main power distro in the car
