'more dots' is the 'high' side. Single dots are the 'low' sides.
With a transformer this is easy, since there can be only one high side.
Redstone energy to the transformers switches them from step down to step up (so they want to suck up low volts and put out high volts).
thanks for the info, yeah, I get it mixed up, output faces you when setting down a storage unit and I got that mixed up with the transformers. Good to remember about the redstone as I was only using it on storage units to shut the output off.