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Okay, have fun.

Grounds can be either way. Electrically, there is no real advantage to either. It's a flip of the coin. The Brits changed to match everyone else because it simply makes logistical & marketing sense to have one standard. Much better for the supply chain. Exactly why I asked for pictures...

A battery does not have a ground. It has a positive and a negative post. Either can be connected to ground, depending on the vehicle's setup. For example, White Freightliners were positive grounded up into at least the '70s or early '80s. Except the ones that came in negative ground, of...

Welcome. :beer: Post a pic of your wiring so we can see how it's hooked up, and where you are measuring. Along with that, disconnect BOTH batteries, and measure from the hot post to the negative post, and tell us what you get for each battery. By the way, you don't have an 85. You...