https://www.ipdb.org/files/889/Bally_1976_Flip_Flop_Schematic_Diagram_continuous.pdf

This link is your schematic

take a look at how the right flippers are wired.

the only difference is the neutral wire(s) on the right flippers is black/yellow and the one on the left flippers is orange/black.

the EOS switch blades are on the lug with the red wire and the middle lug, so you just need to figure out which end lug has the red power wire and which has the other one.

the end lug with the red wire has higher gauge (thinner) coil wire on it.

or put another way, the EOS switch when closed is shorting out/bypassing the low power part of the coil, and the low power coil wire is the thinner wire.

Another way to look at it is that the top and bottom left flippers should be wired exactly the same with the same wire colors (although the coils are different).
Flip Flop flippers (resized).jpg
/Mark

I read the first post as both left flippers were disconnected

can you post a picture of what you have?

you should have orange/black wire on one end lug, a wire to the EOS on the middle lug, and red wire on the other end lug along with a wire to the other EOS blade.

if you have multiple wires of the same color ... e.g. two reds, they should be connected together on the coil lug.

old chicago on ipdb.org has a good picture of the playfield bottom ... tho that game only has two flippers so there may be a difference.

https://www.ipdb.org/images/1704/image-31.jpg

Easy to blow up with your fingers and then take screenshots of the areas needed.

well, the schematic doesn't show it working that way, but the idea is the lower flipper flips first, then the extra switch on the EOS closes and powers the upper flipper.

that was usually to reduce the power surge that would otherwise happen when both flipper coils powered at the same time.

so the white/red wire is the same as the orange/black one ... it's just delayed by the NO EOS switch.

your pictures look wired correctly assuming the red wires are on the correct end of the coil.

is something not working?

since you have two EOS switches:

- the NC one connects to the red wire and middle coil lug
- the NO one connects to orange/black and white/red

at the upper flipper, the white/red connects to the end coil lug ... it takes the place of orange/black.

the NC EOS on the upper flipper connects to red and middle coil lug like the lower flipper does.

disconnect the white/red from the upper coil and see if the game survives a flip.

coil bad sounds right. Doesn't look too healthy either

if you can manually operate the upper flipper smoothly, then you could check resistance with an ohmeter measuring between white/red wire lug and center lug.

compare to right flipper coil.

since the schem is hard to read, the coil should be AF-26-650 / 28-800

also, I'd verify the upper flipper EOS is working ... actually opening the contacts AND not still shorting the blades together elsewhere. If the EOS doesn't work, that'll explain toasting the coil.