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Join Date: Oct 2005
Location: In the Woods Pa
Re: starting battery fuse
every thing should be separately fused. and it sounds like yours are. The radio often has a in-line fuse right at the back.
Many fish finder Sonar units want the cable to be run directly to the battery, not thru a panel or with other circuits that could cause interference. If yours is wired that way; there should be fuse in-line close to the unit or a twist fuse on the fron or rear of the sonar unit.
Some people like to run the sonar unit to the non-starting battery, especially on outboards, as the charging current from the running motor has a very poor quality. What battery you connect what load to doesn't matter except as above.
I have dual batteries with an A_B switch to cross connect the batteries for individual running and charging, can also start on "both". I like that system.
One thing to remember in all this wiring, every connection needs to be secure (and taped or inside a rubber insulated boot). loose connections cause sparking....with gas vapors that is a Ka-Boom.