So I'm planning on rewiring the 33D after I give it a degreasing bath and I was wondering is there anything special in regarding the block heater when I rewire it? Right now the tractor has 2x6V batteries (12V total obviously). I'm wanting to get rid of the 2 6V batteries and just have one 12V battery. Or is it better to leave it with the 2 6V batteries like it was originally intended? Or does it really matter? Any input would be greatly appreciated.