I see several larger shielded wires thru the supplied photos but what I was looking for was a very fine gauge pair that would be run from the base of your turntable and up an thru the tone arm to terminate at the two plug in connections that are associated with you changing cartridge heads.
Since the tone arm pivots, thus the need for skinny gauge, non restrictive wiring.
The best candidates would be your post 22's picture, and if that is a twisted red and yellow pair ***, that would be them. With one being a ground wire and the other a "hot" audio wire that carries the cartridges signal back to the main audio amp portion of the radio.
*** If that is not being a single yellow wire with a red spiral trace marking around it. . . . I can't make that out for sure.
Moving to a turntable swap moots out all of this troubleshooting necessity. I used to always upgrade family and friends 40-50's units with new Voice of Music 4 speed automatic units. Cost was $33 then.