Very nice. Better condition than I thought it would be. Must have been stored inside. You are showing a generator, not and alternator. I believe you still have a 6V system. Your truck looks very original and has a greater head start than most. Depending on your goal and budget, you can drive it as is basically or go all the way. No use telling you a whole bunch of info until you let us know what you have in mind. 1954 is a good year. tclederman is a good source....and lots of AD experts here.
Now that I see it and it's inside and standing on it's own 4 feet, I would just have to start it. So the beginning list before start up is:
Phase I
1. See if motor will rotate, hand rock it in 2nd or... squeeze the belts tight, in neutral, and turn fan. (plugs out).
2. Drain oil. Observe color. Refill and change any oil filters.
3. New points, condenser, rotor, plugs and plug wires.
4. You won't be hooked up to, or using, the gas tank when live fire happens later on.
5. Can you rebuild a carb or have anyone to help with that? A 47 year old carb has to be cleaned and rebuilt

After phase one items check out, we can help with enough wiring to try start and tell you how to install temp fuel supply. Phase 2 will include turning over with starter with plugs out.
Others will have additions to a 47 year restart procedure. It is a long time and take a little extra precaution. Rat nesting, condensation corrosion inside valve cover or deeper, motor dry out, dried deteriorating gaskets and hoses are in play after 47 years. WOW! that's a long time.