PHP Warning: Use of undefined constant VBA_SCRIPT - assumed 'VBA_SCRIPT' (this will throw an Error in a future version of PHP) in ..../includes/functions_navigation.php(802) : eval()'d code on line 1 Single battery isolater positive or negative
The choice is really yours, either will isolate your battery. Having said that, you must make a choice, if you want power (positive) still available to your circuits that could be earthed from a splash of water (salt water is conductive) or if you want no power available to circuits so they cannot be accidentally earthed.
Isolating the positive from the circuits is the safer and more often recommended method.
Cheers
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