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Trolling motor wire

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  • Trolling motor wire

    The used boat I bought, didn't come with trollling motor,but is wired for one. The wire is#10, is the wire size enough? the lenght of the wire is 22 feet. the trolling motor is a 12 volt motorguide 56#.

    Are the AGM or Optima batteries worth the extra cost? I have never had a real problem with lead acid batteries, if well maintained. The main problem is with the boat I have, you have to remove them to check the water level. so when battery replacement time comes, I was going to replace them with AGM or Optima


  • #2
    Re: Trolling motor wire

    You're probably going to draw something like 40A max.

    Is that 22 feet of hot (red) and 22 feet of ground (black), or 22 feet of hot (red) and then grounding to something, like maybe a ground terminal block (with some nice fat wire leading back to the battery), right near the motor?

    If the former, you're dropping nearly 2V in a 12V system, that's too much. You'd want 8AWG or even 6AWG for that kind of distance.
    If the latter, you're dropping closer to 1V, much more acceptable, but still too much for my comfort.
    San Diego, CA "The 619"

    "Nemo" (since Jul 2004): 1978 StarCraft 15' TriStar, 1978-88 "FrankenMotor" Mercury 70
    Unnamed (since Dec 2016): 2000 Sea Hunt Triton 172 CC, 2012 Mercury OptiMax 125

    "It's always easier to ask forgiveness than permission" -Colin Powell, et.al.


    • #3
      Re: Trolling motor wire

      both red and black are 22 feet long or 22 feet from the battery to trolling motor receptable,

      If I go to a 24 volt trolling motor what be the right wire
      ohm's law as voltage goes up amperes drops correct?

      appreciate the input


      • #4
        Re: Trolling motor wire

        While your understanding of Ohms law is valid, it only applies if all things except voltage remain the same. 24 volt motors start at about 70# of thrust and it takes more current to make thrust so that comparison is not valid. I don't have numbers for MotorGuide but a 70# Minnkota will draw 42 amps worst case. A 55# 12 volt Minnkota draws 50 amps worst case. So spending much more money for a 24 volt motor in hopes of not having to change a few bucks worth of wire just doesn't make sense. It makes even less sense to put a 70# motor on a boat that doesn't need it.

        As for batteries, in my view it is a waste to spend big bucks for a trolling motor battery when a group 27 or 29 deep cycle for well under a hundred bucks will do the same job as the so called "hi-tech" batteries. A group 27 deep cycle at my local farm store is regularly priced at $75 and can be had on sale for $69 and it has higher reserve capacity than the same size AGM.


        • #5
          Re: Trolling motor wire

          Running a MK #80 24v system that moves a 3000 to 3600 lb boat (depending on load) pretty good. Would be nice to have the #101 thrust motor though..., but the 80 does just fine! Boat was originally wired for 12v trolling motor with I believe 8AWG wire (if not 10AWG, not sure). Its a 20 ft run. I re-wired to a 6AWG knowing that my motor I believe is 56 amp draw max....or around there. That way I'm on the safe side and no worrys about wire gauge being too small. As recommended to me, I would at least use 8 AWG...being a long run and 24v system.

          As for batteries....2 interstate srm 29's (210 min RC), more than plenty enough battery! My cost was $220 for two OTD in 2010, going on fourth season their still in "like new" conditon. I agree with Silvertip that a good group 27 or 29 will do just fine at a lower cost than so called "hi tech" ones. Also I bet that the warranties are pretty close in comparison to each other....JMO.
          2006 Tahoe Q6 S/F
          4.3L TKS 190hp
          A1 G2 1:81 RW Cooled
          14x20x4 MW Vortex Alum
          SX Smart Tabs #60


          • #6
            Re: Trolling motor wire

            Thanks guys for the input


            • #7
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              Re: Trolling motor wire

              That's what they said in my Minnkota (PD55 12V) owners manual. Use the provided 4ft of 10 ga. or, if you extend it, use 6 ga.

              1991 Boston Whaler Outrage 17 I
              2005 Evinrude E-Tec 90hp

              Fishing isn't a matter of life and death.... It's much more important.