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#4291998 - 12/26/09 09:24 PM Trolling Motor Amp Question
drjntexas Offline
Green Horn

Registered: 11/26/09
Posts: 16
Loc: Waco, TX
I am a new boat owner and I have an 84 Cajun with an older trolling motor (Motor Guide Brute model 3400) that needs to be replaced. Boat is set up to run two 12 volt batteries to the TM and it has a switch on the bow that reads 12 on one side and 24 on the other. The current TM has a plug that reads "30 amp 125 volts" and plugs into a receptacle in the bow of the boat. I'm looking at buying a new TM (either a 55 lb thrust 12 volt Minn Kota or a 70 lb thrust 24 volt Minn Kota). Both of these have a max amp draw of 50 and 42 respectively according to the Minn Kota booklet. I had planned on connecting the new TM to the current plug, but I'm not sure that I can based on this inforation. Any advice is appreciated. Thanks

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#4292769 - 12/27/09 08:44 AM Re: Trolling Motor Amp Question [Re: drjntexas]
_Mike_ Offline
Pro Angler

Registered: 06/19/04
Posts: 675
Loc: Grand Prairie, TX
You're on the right track. The wiring and receptacle will have to be upgraded to handle the extra electrical load. Parts should all be available where you buy the TM. Don't forget to get the proper circuit breaker for your set up.
_________________________
Mike

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#4293206 - 12/27/09 12:17 PM Re: Trolling Motor Amp Question [Re: _Mike_]
j.steve Offline
TFF Celebrity

Registered: 04/11/01
Posts: 6799
Loc: CentralTexas
Personally I do not like the jumper wire to be in the bow inside that plug. have had 2 melt on me on older boats. I would run new 6 gage MARINE GRADE wires from stern to bow. I'd put an inline 50 amp circuit breaker as close to the batteries as possible. I also prefer the manual reset breakers. On a 12/24 system you have to place the jumper wire from the + of 1 battery to the - of the other battery. I prefer this jumper to be on the batteries instead of a weak arsed plug set-up as they used to be done on older boats.
_________________________
2 Thessalonians 1:6-10
In these verses, there are dire consequences for NOT obeying the gospel. What the world claims as "saved" isn't gonna cut it! Learn what it is, in an eye opening true story, "Muscle and a Shovel", by Michael Shank.

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#4293238 - 12/27/09 12:39 PM Re: Trolling Motor Amp Question [Re: j.steve]
Allison1 Online   sleepy
TFF Guru

Registered: 12/14/03
Posts: 15840
Loc: Grand Prairie, Tx
If you've got a bow switch for 12 or 24 you should have 4 wires going from the battery compartment to the front. If you want to make sure you have an ample wire size, pair up the wires to make you two, two wire sets or double up the wires. That should be plenty for anything you plan to put on.
Remember that 24 volt trolling motors will carry twice the power per amp that a 12 volt system. A 70 lb 12 volt trolling motor will have a load approx twice the amps of a 24 volt system.

Another thing is the pulse width trolling motor versus the standard. Most of the newer motors that have the variable speeds are pulse width. The motors with the numbered speeds are the old school. The pulse width motors will use or need lower amps per lb of thrust.

In other words, get the 24 volt trolling motor if its a choice. Less amps per lb thrust that way.
Then look at the motor and if its got pulse width (dura amp for Motorguide and Maximizer for Minn Kota).

Good luck, if you have the 4 wires from the battery compartment, pairing them up to make two (one pos and one neg) should be all you're going to need along with doing a little wiring to the plug. Thats simple too. Just one positive wire to the post that will go to the positive wire on the trolling motor and one neg to the negative on the motor.
If thats what you're doing, wiring for 12 or 24 is easy too.
For 12volt if you're going to still use two batteries, take one positive wire and connect it to the positive post on one battery and then to the positive on the trolling motor(through the plug)
Then do the same with the negative....neg to neg.
Then to connect the batteries together just take two jumpers and jump the batteries, pos to pos and neg to negative.

If 24 volts, positive from trolling motor should go to positve on battery one. The negative trolling motor wire should go to the negative on battery two. Then use one jumper to jump from the two non used poles. (neg on batt one to pos on batt two).


Clear as mud, sorry if it sounds confusing, its actually pretty simple the first time you see it.





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#4295819 - 12/28/09 05:01 AM Re: Trolling Motor Amp Question [Re: Allison1]
hopalong Online   content
Super Freak

Registered: 09/06/08
Posts: 73007
Loc: formerly of guthrie oklahoma
Originally Posted By: Allison1
If you've got a bow switch for 12 or 24 you should have 4 wires going from the battery compartment to the front. If you want to make sure you have an ample wire size, pair up the wires to make you two, two wire sets or double up the wires. That should be plenty for anything you plan to put on.
Remember that 24 volt trolling motors will carry twice the power per amp that a 12 volt system. A 70 lb 12 volt trolling motor will have a load approx twice the amps of a 24 volt system.

Another thing is the pulse width trolling motor versus the standard. Most of the newer motors that have the variable speeds are pulse width. The motors with the numbered speeds are the old school. The pulse width motors will use or need lower amps per lb of thrust.

In other words, get the 24 volt trolling motor if its a choice. Less amps per lb thrust that way.
Then look at the motor and if its got pulse width (dura amp for Motorguide and Maximizer for Minn Kota).

Good luck, if you have the 4 wires from the battery compartment, pairing them up to make two (one pos and one neg) should be all you're going to need along with doing a little wiring to the plug. Thats simple too. Just one positive wire to the post that will go to the positive wire on the trolling motor and one neg to the negative on the motor.
If thats what you're doing, wiring for 12 or 24 is easy too.
For 12volt if you're going to still use two batteries, take one positive wire and connect it to the positive post on one battery and then to the positive on the trolling motor(through the plug)
Then do the same with the negative....neg to neg.
Then to connect the batteries together just take two jumpers and jump the batteries, pos to pos and neg to negative.

If 24 volts, positive from trolling motor should go to positve on battery one. The negative trolling motor wire should go to the negative on battery two. Then use one jumper to jump from the two non used poles. (neg on batt one to pos on batt two).


Clear as mud, sorry if it sounds confusing, its actually pretty simple the first time you see it.

+1 spot on with that info.



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FISHERMANS COVE MARINA - 903 474 7479 reservations
Originally Posted By: Kattelyn
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#4295822 - 12/28/09 05:03 AM Re: Trolling Motor Amp Question [Re: hopalong]
hopalong Online   content
Super Freak

Registered: 09/06/08
Posts: 73007
Loc: formerly of guthrie oklahoma
just use the 2 wires and create a 24v hook up, did the same thing on mine and it has worked great for over a yr. now.
get the 24v motor as your batteries will last longer due to lower amp draw, more power means less use in most instances.
_________________________
FISHERMANS COVE MARINA - 903 474 7479 reservations
Originally Posted By: Kattelyn
young rabbits are the snickers bar of the wild. Everything eats them.

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#4306199 - 12/30/09 09:43 PM Re: Trolling Motor Amp Question [Re: hopalong]
drjntexas Offline
Green Horn

Registered: 11/26/09
Posts: 16
Loc: Waco, TX
Thanks for everyone's help. I've decided to try my hand at making it a 24v setup. Spent yesterday buying a circuit breaker and all the other parts to make the system work. Even though it costs a little more, everyone has sold me on buying a 24v TM. Thanks again for all of the advice.

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#4306500 - 12/30/09 10:58 PM Re: Trolling Motor Amp Question [Re: drjntexas]
kingdad101 Offline
TFF Guru

Registered: 10/24/05
Posts: 20705
Loc: W.F. Texas


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