what are these wires ? 1972 dart 318

i am trying to track down a possible grounding issue . automatic , everything is stock . the car does not have a firewall to block/head ground strap . but what is this that looks like it is attached to the trans housing ? rear almost center of the firewall , right below the coil . near the dist. . first two pics the black wire/s going to trans . this then goes to the yellow bit in the center of the next photo , with that one wire at the top then going to the starter relay . the wiring diagrams in the manual , are not helping me . anybody know ? thank you .

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