Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
Murdock

What gauge for trolling motor wire?

9 posts in this topic

Having problems with the trolling motor not working and then works again. It is not the fuse and I have had the motor clinic go over the actual Minkota, no problems found. Next step is to simply replace the wire from the battery to the power plug. What gauge wire would you recommend? Any other suggestions as to what to look at that may cause this problem?

Share this post


Link to post
Share on other sites

Assuming that your fuse/circuit breaker is not tripping, how do you figure replacing the wire will help? If you think it's wiring, maybe a loose connection is possible.

Share this post


Link to post
Share on other sites

I agree on checking all connections, this sounds like a good candidate for the problem.

What gage wire do you have? Over what distance? The voltage loss through 12V DC can be large with thin copper, even over relatively short distances. My current Lund was pre-wired with 8 gage from bow to stern. I shortened the run by moving the battery to the bow and kept the 8. I wired my old boat in 6 gage from bow to stern. If you have 10 or higher you have the potential for problems.

Share this post


Link to post
Share on other sites

My Minnkota worked intermittently too. Initially I bought a new battery, which didn't help, and then I took it to the shop. They told me that the foot pedal was causing the problem. They replaced the circuitry and I haven't had problems since.

Share this post


Link to post
Share on other sites

Thanks guys, I have a 17' Alumacraft Trophy with the battery in the stern, Minkota on the bow. I think it is wired with 8 gauge right now. The connections are all good. I might have to bring the foot control into the motor clinic to have them test it as the possible cause. Does anyone know if a guy can simply buy a new foot cotrol from Fleet Farm and plug it in, ready to use or is there some sort of interface programming that needs to occur?

Share this post


Link to post
Share on other sites

Need more info....what motor, what LB thrust, and

what is the circuit breaker rating in the motor circuit.

Share this post


Link to post
Share on other sites

The TM is a 55# Minkota with a 50 amp reset inline fuse. The guys at the Motor Clinic helped me choose the inline reset fuse so I am doubting it is the fuse. Thanks again for the suggestions and any future suggestions guys!!

Share this post


Link to post
Share on other sites

For 50 AMP worst case calculations, here you go:

6 gauge wire is 0.000465 Ohms/foot, Voltage drop is 0.02325 V/ft, and power dissipated is 1.16 Watts/ft.

8 gauge wire is 0.000739 Ohms/ft, Voltage drop is 0.03695 V/ft, and power dissipated is 1.85 Watts/ft.

The number to watch here is the power, which is dissipated in the form of heat. As the wire heats up, the resistance increases, and more power is dissipated, creating more heat. This runaway continues until the cooling effect of the ambient atmosphere around the wire quenches the runaway. All of this causes more voltage drop.

One Watt does not seem like much, but it can generate quite a bit of heat. Best to use the largest wire that will work for the application, considering cost, connectors, etc.

Another thing to watch is that a poor connection can be relatively high resistance, thus adding the the total voltage drop of the circuit prior to the motor.

Share this post


Link to post
Share on other sites

Check the plug, you have referred to it a couple times, make sure the plug or pins are not corroded or bent, or burned. 8 ga wire should be able to handle the load in 20 ft. the biggest culprit sounds like the pedal on most posts. good luck.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0



  • Posts

    • If this crazy weather keeps up a guy might have to go to the mountains to have enough snow to ride.
    • I purchased a 20v 986 Dewalt brushless and used it with my Nils 8" and could not believe how fast it cut. Very close to my Tanaka motor as far as speed. My plan is to use it with my 6" Nils but wanted to give it a good test and it passed with flying colors. 
    • Pretty sure Bernie had that figured out. After the primaries I voted for "not Trump" You guys haven't picked up that liberals are still going for not Trump, even if that means Mike Pence (who from a political position standpoint is worse for liberals).   Instead you have Trump, a man incapable of taking any form of criticism regardless of how irrelevant it is to anything. Why do I post the crowd sizes? Because Trump, in a speech given only to members of the CIA, thought it was important enough to mention, as well as to have a team of his own people there to applaud when he mentioned the size of the crowds.
    • Here's the exact reason why I encourage everyone to buy the digital readout.  After getting holes drilled and everything setup, I always run my bathroom roof fan/vent to get rid of the moisture as the slush on the floor gets melted.  Yesterday I cranked the fan on max which moves some serious air, but I forgot to crack a window, which caused it to actually suction the CO from my water heater back into the house through a propane line pass through.  I looked up and saw 30ppm on the CO detector, which isn't high, but an indicator that something wasn't right.  All it took was cracking a window and turning down the fan for a minute and it was back to 0.  
    • You do realize the person you wanted to be president couldn't even understand the proper protocol for setting up a cabinet level email account don't you?    
    • I looked into fiberglass a few years back for a build.  I decided against it as it needed a wood backer.  Not sure if there is a different product out there now.  
    • finally got out Friday, put on 75 miles in the heavy drizzle, not the first time I have riden in the rain. the trails were OK, I rode in aitkin co. that doubles the miles I put on in the last two years.
    • they load tested the battery and said it was bad, everything else they said was fine, they put in a new battery. tried it today after sitting since Tuesday, and it started up fine, problem fixed.   I have a 2002 grizz carbed, and that sat for close to 3 months, went to start it this weekend, and it cranked for at least a minute (very cold blooded machine) and it started, it has the same battery that's in the Polaris.
    • Precious snowflake Trump needs a safe space from the media apparently.   I suggest you familiarize yourself with the word kakistocracy, because that appears to be the road we will be traveling down.
    • No,I am saying those who are left with jobs are working for those who Obama is happy to give money to for nothing. He was as bad as it gets in terms of getting people back to work after a recession especially when you factor in the amount of money he spent to do it.
  • Our Sponsors