What size fuse/breakers for battery Isolator?

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Mar 11, 2010
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I had a battery isolator installed 12 or so years ago.

Somehow both fuses got corroded to the holders. One broke, and then the second one broke when I tried to open it to figure out the fuze size of the first. I can't figure out what size fuses they are.

I looked online and I'm reading articles about how the fuses should be "Up to 200 amp", then another says if it is 2 gauge wire to have a 150 amp. The fuses don't look like they are 150 or 200 from my experience, and look like they were probably 60-100 at most. I think its actually 4 AWG and not 2.

Does anyone have any idea what size fuses I should replace them with? (I'm actually going to replace them with breakers, but the point should be the same)

Thanks!

Its a small 190 HP boat with two 12 volt batteries- one for the stereo and trolling motor, the other for starting. I have no idea what the amperage on the alternator is, but I believe its in the ballpark of 65 amp per mercurymarine.com . Does that mean a 60 or 80 is sufficient?
 
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