Hello and Welcome to iRV2
Read Allison locked out and stuck in driveway, for some ideas on where to check for a poor connection, low voltage supply , that may be the cause of your problem.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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