Trolling Motor - Breaker Needed???

Ruler2112

Cadet
Joined
Oct 27, 2009
Messages
28
A 30 pound thrust transom mount trolling motor came with my used 14' aluminum fishing boat when I bought it. The ends of the wires had clamps on, which I just connected to the posts of the 12 volt battery I kept in the back of the boat. Used it for 8-10 years without any problems. That trolling motor went to trolling motor heaven a couple years ago.

I finally broke down and bought a new trolling motor a few weeks ago. I got a 55 pound thrust Minn Kota transom mount, figuring that I'd have no problem moving the boat with it at a lower speed, have more than enough power if I should need it, and would be able to reuse the motor should I ever get a bigger boat. I put it on the boat and noticed right away that it has flat prong-type ends on it. In order to connect it to the top-post batteries I have, I used a band clamp (insert American Pie joke here ;) ) to hold a 1/4" bolt on, then used 3 nuts (2 tightened against each other and the prong between those and the third) to connect the battery to the bolts. Worked perfectly and the motor was great during that fishing trip.

A few days later, I paged through the directions that came with the motor. It said that I needed a 60-amp manual reset breaker near the positive battery terminal. Didn't say anything about why though.


Questions:

First, is such a breaker really needed or is it just another BS thing they want you to buy? Seems to me like marine equipment manufacturers think that anybody who owns a boat has tons of extra cash laying around. This definitely does not describe me, as you can probably tell from the bolt & band clamp solution described above. (I have a functional boat to fish with and that's what it's used for. If I didn't need a boat to fish for most of the year, I'd never own one; don't really like boating or boats in general...)

Second, if a breaker is needed, would a 50 amp be sufficient? I ask because the Minn Kota brand is the only 60-amp breaker that the store has and it's $40! (So much for the $50 rebate Minn Kota has going that I counted on! :( ) They do have an off-brand (Sea Champ or Sea King or something) 50-amp breaker for $7, but I don't know if it'd work or blow all the time.
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Trolling Motor - Breaker Needed???

Although a breaker is less important on a stern mount mount motor because the leads are shorter, the fact that you have permanently attached the leads means that power will always be present on the system. Should anything puncture the wires, more specifically, wear off the insulation you have an instant arc welder. Your motor draws 42 - 46 amps maximum so while you might get away with a 50 amp breaker, a 60 is the better choice and Minnkota apparently agrees. So the truth is, if you are a risk taker, you don't need the breaker. If you value your property it is a small investment to protect the boat and garage it may be stored in, the home it may be attached to and the occupants of the dwelling. If the boat is never inside, that's another scenario. When it comes to safety, ANY powered circuit on any craft needs to be fuse or circuit breaker protected -- just like every circuit in your house and car.
 

StickyWidget

Seaman
Joined
Aug 2, 2011
Messages
72
Re: Trolling Motor - Breaker Needed???

I had the very same trolling motor, I too connected straight to the battery. When using my engine I would pull the trolling motor and place it inside the boat. One day something bumped the controls to on and since the prop could not spin it just turned into an expensive toaster. Melted the wires until the insulation dripped off of them and fused the bearings inside the motor it also melted the switching mechanism inside the handle. I no longer have this trolling motor. When I can afford another one you better believe it will have a breaker and a plug and receptacle so I can store it without it still being connected.
 
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