While there are advantages to adding a fuse block and relays, these were not used in trucks through 1955-1st. Good wires, good terminations, correct wire sizes, good grounds (usually screws into sheet metal - prone to corroding) all were sufficient when using standard equipment and factory accessories.
Not all accessories were attached to the ignition switch. The light switch was sometimes used and in a few cases a live post on the ammeter or other screw-post were used
for some accessories.In different Advance-Design years, different electrical attachment points were used for different standard components and accessories, such as a cigar/cigarette lighter (probably the highest power-draw), radio, heater motor(s), electric wipers (in 54/55), and auxiliary lamps. Check out the link above, and you will see a fuse block for a car.
Once again, a fuse block and/or relay(s) are good, but the ignition (key) switch is not the only place where electrical power was obtained in an original configuration.
