I am not really sure what is going wrong for you. Could DM me on RM Web Forums or Discord with a game where the rumble is not working so I can download and take a look at it, as all of the auto rumbles work in my test project so it is hard for me to troubleshoot.
RM Web Forums: https://forums.rpgmakerweb.com/index.php?members/caspergaming.493/
Discord: https://discord.gg/Gbx7JXP (I am Casper Gaming all the way at the top of the member list).