Single battery isolater positive or negative

[devocean]

Hey guys do u isolate the positive or negative wire on a single battery isolater

[stockhorse]

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

[Yobbo70]

positive or both via a dual pole isolator