Hi Jframier,
Welcome to the Heartland Owners Forum and to the family. We have a great bunch of folks here with lots of information and all willing to share their knowledge when needed.
Not sure about reversing the current flow,, I think some 12v dc motors will reverse directions and some will not. Hopefully someone that has that problem will jump in soon with more info.
Be sure and check out our Heartland Owners Club. Join us at a rally when you can and meet lots of the great folks here and make friends for a lifetime.
Enjoy the forum.
Jim M