Originally Posted by AZ T&T
I think the problem you are having is you need: On - Off - On w/reversed polarity.
I think that the above is the basic issue, too. A DC motor is reversed by switching the direction of the power. It sounds like the switch you bought is a simple "On Off On" switch, but what you need is a switch that reverses the polarity at one "On" position.
I don't think this is the exact switch
you need, but one that operates like it this one does in the diagram.
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch