Alfatronix Ltd, Fit and Forget - Converters and Power Supplies for the Communications, Automotive and Marine Industries

Are there any positive earth vehicles around?

We are not sure. There were plenty of cars around in the fifties with positive earth. But then all European manufacturers went floating earth or negative earth. We hear rumours that some eastern European countries may still be using positive earth and possibly some US manufacturers. If in doubt, fit a fully isolated converter, they are safe on any 24vdc electrical.
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