I suspected bad distance reads where due to power surges on the one battery system
You don't get any power surges on a battery, so I don't know what you mean.
Supply decoupling and common grounds are vital, reading these links might help you:-
I suspected bad distance reads where due to power surges on the one battery system
You don't get any power surges on a battery, so I don't know what you mean.
Supply decoupling and common grounds are vital, reading these links might help you:-