Thread: hooking up trolling motor and sonar

For the sonar an inline, glass 3 amp fuse should do it. You can go to any auto parts store and buy the inline fuse holders and glass fuses. You can either fuse the trolling motor or do like I did and go to a boat dealer and buy a breaker for your trolling motor. The size of the breaker will depend on the size of your trolling motor and the wire to it. If it's a new motor it should say somewhere in the owners manual. If it's not new you may have to ask a dealer. Whether you go with fuses or a breaker you need to get it sized right tho..too small and it will trip while operating normally and too big will allow your wiring to catch fire before it tripped if you happened to have a problem. Large trolling motors pull a lot of current at 12 volts...my breaker is a 40 amp breaker. If you get a breaker you don't have to worry about keeping a couple extra fuses in the boat somewhere. Oh..also, put the fuses (and/or breaker) in the positive line.