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I still have no idea which truck you are fixing.
All the 809 and 939 series trucks are notorious for loosing prime due to aged rubber lines(especially the one from the filter to the IP.
Change all rubber hoses and be good for a few more decades.
Are you using your cold start system?
Which one do you have?
You may simply have a bad battery cable. Measure each one.
Also load test your batteries.
Merged with your old thread, since all that info is useful to know here and this seems to be a continuation of that issue.
Learning to weld aluminum is great.
Learning on a dirty transmission, inverted is not the way to learn.
Even if you had it out and cleaned it the best you could inside and out, it is still going to be tough to weld due to oil impregnation in the case.