Unless it is an electronic regulator, it should make no difference whether it is used with positive ground or negative ground. Electronic regulators use diodes and transistors and thus are dedicated Positive OR negative ground.
What makes an electro/mechanical regulator positive or negative ground in the material used for the contact points. A regulator dedicated to either positive ground OR negative ground will have contact points made of different materials for longer life. A regulator designed for both positive ground AND negative ground will have both contact points made of the same material which results in a shorter working life.
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