Well found a wiring diagram at last via Ebay. After many many hours of searching. A seller named jo296ro , who also carries most everything else new or used for a postal jeep. Turns out my jeep is likely a 1976 and not a 1975.
I've ordered a painless wiring harness #10142 the WATERPROOF HARNESS 12 CIRCUIT ( could be 18 circuit the manual has a different circuit listing then the description at summit) with what is hopefully the correct ignition key switch. 25 Amp rated. Painless part # 80153
The 30 amp waterproof one just is not in my budget today.
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I have the shop manual, but it is missing the electrical drawing for my 1975 DJ-5D, the LEGOJeep.
The jeep is covered in LEGO sheets and you can move around LEGO bricks on top. Pretty fun and popular in the San Francisco Bay Area.
It had an electrical fire last summer and the mechanics hack is no longer up to stuff. That mechanic is based 70 miles away so can't easily go back.
So I need to at minimum get the backup lights working for a DMV brake and light inspection by this weekend. Then soonish replace the wiring harness with a painless harness.
I've spent way too much time searching AMC and jeep forums for the electrical drawing / trying to figure it out myself by comparing CJ-5 ( 1971 to 74 drawings from Chiltons) and various 1970's era AMC wiring diagrams.
None really match close enough.
I'm looking for something quicker then spending $60 for a replacement shop manual book - to get running for this weekend.
At this point I would be happy to purchase a high quality scan from someone, but I can't post to classifieds for another 20 days.