Tony Albanese Posted June 5, 2017 Posted June 5, 2017 I have a 18ah battery I am going to use to run my fishfinder. My question is, where/how do I ground the fishfinder? I don't much about electric but couldn't find anything else online. I'm going to do one of those DIY battery boxes Quote
Super User J Francho Posted June 5, 2017 Super User Posted June 5, 2017 You don't need a ground. You want to put an inline fuse on the positive line. Quote
Tony Albanese Posted June 5, 2017 Author Posted June 5, 2017 Perfect. Thanks! I was already doing the fuse but wasn't sure about the ground. Quote
Tony Albanese Posted June 6, 2017 Author Posted June 6, 2017 Does it matter what kind of fuse I use? ATM Mini's, ATC? Quote
BobP Posted June 9, 2017 Posted June 9, 2017 Most sonars are powered by the boat's starting battery which is connected to the motor - which serves as the boat's ground to the water. Don't know what kind of boat you have or how it's wired, whether there's also a trolling motor, etc. but if you have interference problems coming from the engine or the TM after trying the direct to stand-alone battery, check YouTube for possible fixes. Quote
Super User WRB Posted June 9, 2017 Super User Posted June 9, 2017 18 amp/hr is a small battery that the OP could be using for a kayak. Most sonar units recommend the fuse size, about 3 amp with inline water proof holder is common . Tom 1 Quote
Tony Albanese Posted June 9, 2017 Author Posted June 9, 2017 I have a small 14'er with an outboard and bow mount. I got it all hooked up. Took me a while to fix a decent waterproof box for a battery of that size. Thanks everyone Quote
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