Welcome to iRV2 .
Have to ask if the Allison shift pad lights up ?
I'm not sure if your VIM looks like mine , or the one that's used on Spartan chassis , but there could be fuses under the VIM cover .
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.