Just a quick , hint , " when all hell broke loose " is there any chance you blew a fuse on another chassis system
( e.g. brake lights ) for safety reasons some chassis have to have working brake lights in order for the cruise to engage . There may be a cross over to the Jake brake as well .
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.