Quote:
Originally Posted by Bibio
ermm nope. both negative and positive are live depending on if there is a device in between
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and in a vehicle we usually tie one side of the battery to the chassis as the return path and we
define this as either negative earth or positive earth. 
(even though it is isolated from the ground)
We stopped using positive earth because of galvanic corrosion.
Irrespective of definitions, we couldn't fix his bike.