This could help. On CaseIH machines these functions are on individual relays which are energized by another relay which is energized by an oil pressure switch on the engine. When I had this similar problem it was sporadic. To make sure I fixed the problem with one shot I replaced both the sending unit and the main relay. Was told this setup was for safety so you couldn't drop the header, reel, etc. by just turning the key on and not have the engine running.