Here is a diagram of a polarity reversing switch. The actual wiring is very straightforward...more so than the theory.

Unless this is a restoration, removing this dinosaur would be your best bet. It's so simple even a 13 year old could do it.

http://chevy.oldcarmanualproject.com/electrical/wiring/pdf/42truck.pdf

Stuart

Last edited by atomarc; 06/05/2008 10:10 PM.