What I find indicates TN is a open primary state. Not sure of exactly how it works.
In Texas one didn’t register by party and selected the party ballot in which you
wanted to vote when you went to the polls on primary day. So I was wondering how
it worked in TN. Thanks for your response.
http://ballotpedia.org/Voting_in_Tennessee
https://www.google.com/#q=tennessee+open+or+closed+primary
I have worked at the polls a few times here in Tennessee. When a voter prepares to fill out the application for ballot, we ask “In which primary do you wish to vote?”, and there is a place for the voter to mark his or her choice. Once the primary has been selected, a machine operator prints an access code for the voter to take into the booth, and it brings up the primary that was selected.