They heat up "open" the circuit, when they cool down (normal current draw) they "close" the circuit.  Multi use

Wild, I thought they just used glass fuses, are those like internally melting (one time usable) elements? 

Sorry for the late reply but you probably know by now those small metal devices with two posts are circuit breakers. 

64F100 57FAIRLANE500

What gives, are the newer 1154s wired in reverse compared to the older ones? Anyone else run into this issue?

...  duh ...

Revelation.

The bulbs themselves are reversed wired according to vehicle POS or NEG GRD.

I learn't something new today. I did not know that and of course, it took a while to settle in but I learn't something.

My 3rd grade education (two tours) is finally starting to pay off ... 

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There is no stupid, only learning.

Those are either relays or circuit breakers. You would have to trace the wiring to see where it goes.

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Thanks for that conversion table, that was a big help. I actually got the issue figured out, it wasn't a wiring issue it was the bulbs. I bought new 1154 bulbs not knowing 1154s were still 6v. I guess it's stupid to think so but I actually thought all bulbs sold for cars were 12v now. I went ahead and bought some 2057s and everything works fine now. Thanks for the help guys.

This should be my last ever question on this thread, but are you guys aware of what these are under the dash? They have power leads going into them but I can't tell if the little blocks there are just junction posts or actually some kind of relays, they don't show up on any of the schematics I can find. Maybe they're just hookups for accessories like the clock and such? I'm wondering if they might be a good spot to hook up my voltmeter to.

" ... but why would they sell it in the kit if they were selling you light bulbs? I figured it must work for both, is that not the case?" 

You have to be very careful of vendors these days. They are usually out for quick bucks offering cheap off-shore service parts.          

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Lighting System

This usually is simple.You DO NOT need to switch your headlight switch, the brake light switch, headlight high beam switch, the headlight circuit fuse, and the turn signal fuse. They are fine for a 12v system. You will want to change your turn signal flasher for a 12V unit. Just take the old 6V one in and match up a 12V replacement. The wires connect to the similarly labeled terminals on the 12V flasher. Now just change out the bulbs. Look closely at the sockets and make sure they are clean and not corroded. Usually, you can just take one of each type of 6V bulb you have and find its 12V equivalent. You want to pay attention how the base is made and the size of the bulb. Sometimes you may have to change out the pigtails in a socket to make them work. Pigtails are the bottom terminals that push into a socket and have the wire ends. Or you may just change the entire socket.

SOURCE - https://classicautoadvisors.com/2021/07/12/classic-car-6-volt-to-12-volt-conversions/

All you need is a 1956/ 2-BLADE 12V flasher. Take your 6V in with you to ensure correct pin-out.

- 6V TO 12V LIGHT BULB CONVERSION CHART -

ALSO - https://vintageautogarage.com/search-results/?pfresults=true&f_year=1956&f_make=Ford&f_model=All%20Carsexcept%20Thunderbird

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It is, but also I didn't choose the part it just came as part of my 12v convo-kit. The same kit optionally sold replacement 12v light-bulbs (non-led). I thought the same thing as you, but why would they sell it in the kit if they were selling you light bulbs? I figured it must work for both, is that not the case?

Is this the flasher PN you used?

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