There is no circuit break on the panel. Question: Where is the circuit breaker on the 1981 Chevy G-10 L6 4.1 L van?

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In the 1981 Chevrolet Light Duty Truck Service Manual, On page 8A - 2 fig 8A - 1 Fuse Panel shows two circuit breakers for the "G" and one for the C-K. There is no circuit break on the panel. Question: Where is the circuit breaker on the 1981 Chevy G-10 L6 4.1 L van?