Welcome to iRV2.
The problem you describe sound like bad connection at the chassis battery , as soon as the starter load hits the connection fails .
Odd that the engine starts when the shift panel has no display .
If you see an Allison module like the one in the picture there are two 10 amp fuses inside that need to be checked.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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