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This is a baffling concept. However, please rest assured that with a bad or weak ground in a single wire circuit, some strange things can happen. I had weak headlamps and direction lights that had both filaments lit. It was a weak or poor ground. The circuits were "feeding back" on the positive side to a ground on a different circuit. This was traced back to powder coating on the frame grounding point that was acting somewhat as an insulator.

ERA has an auto wiring primer that explains all this and also explains all the various components and how they work in the Cobra. You may want to ask Bob Putnam of ERA if he can grant you access to the ERA wiring primer.