Yes, the 99 is a low shank machine
Hmmm, now I'm not so sure. But, with the three pin plug it should work. I'm just not sure what is up with the two loose wires.
Some wiring diagrams can be found at
http://www.doubleveil.net/zssmp/resources.htm
https://oldsingersewingmachineblog.c...ntage-singers/
http://ismacs.net/singer_sewing_mach...g_machine.html
I have a Singer 319 that had the foot controller directly wired to the motor, but it had a three pin plug. I was able to plug another foot controller with the three pin plug. We joked we had dueling controllers.
Janey - Neat people never make the exciting discoveries I do.
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