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Max Online: 36273 @ 01/23/13 02:34 PM
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#12758810 - 05/17/18 09:06 AM Trolling motor loss of power
pwarren Offline
Outdoorsman

Registered: 03/29/16
Posts: 144
Loc: Lakeside, TX
The last 2 times taking the boat out I have noticed the large reduction of power my trolling motor has. I now have to put it on the highest setting to be able to go anywhere, and even still it just barely trots along. I checked the connections to the two batteries and looked like a little corrosion. I cleaned the corrosion but the trolling motor is still weak. Both batteries that are hooked up to the trolling motor are fully charged and are good batteries. Is this a sign that the trolling motor is on its way out? Any ideas would be appreciated.

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#12758918 - 05/17/18 10:09 AM Re: Trolling motor loss of power [Re: pwarren]
texasbass1 Online   content
TFF Celebrity

Registered: 02/12/05
Posts: 5999
Loc: The Colony, TX
What is the voltage at the TM plug? You may have corrosion where the wires attach to the plug.
How do you know the batteries are good? Age, voltage after setting or just a good guess? Not being a SA but batteries can be bad even if new.
_________________________
Pat Leach



USAF MSgt Retired

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#12758945 - 05/17/18 10:27 AM Re: Trolling motor loss of power [Re: texasbass1]
pwarren Offline
Outdoorsman

Registered: 03/29/16
Posts: 144
Loc: Lakeside, TX
Originally Posted By: texasbass1
What is the voltage at the TM plug? You may have corrosion where the wires attach to the plug.
How do you know the batteries are good? Age, voltage after setting or just a good guess? Not being a SA but batteries can be bad even if new.



I haven't checked the voltage at the TM plug, I'm not 100% sure how to do that. I'll check to see if there is corrosion where the wires attach to the plug tonight.

The batteries are 2 years old this month and have sat for a few months with voltage still over 12.5V before I started taking the boat out a couple months ago. I guess I could take them out to get tested to be sure they are still good.

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#12759061 - 05/17/18 11:34 AM Re: Trolling motor loss of power [Re: pwarren]
don the angler Offline


Registered: 09/05/01
Posts: 5126
Loc: Dallas,Texas,USA
Probably the batteries. I had the circuit breaker go bad & that produced those symptoms. Check for monofiliment behind the prop.
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#12762474 - 05/20/18 11:12 AM Re: Trolling motor loss of power [Re: pwarren]
pwarren Offline
Outdoorsman

Registered: 03/29/16
Posts: 144
Loc: Lakeside, TX
I had the batteries tested and are both good batteries. The problem was that 1 battery was 30% and the other battery was around 68%. I hooked the batteries back up after them being charged and the trolling motor seems to have it's normal power back. So I'm going to replace the ancient onboard charger. Thanks guys!

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#12765101 - Today at 12:07 PM Re: Trolling motor loss of power [Re: pwarren]
sll Online   content
Green Horn

Registered: 05/16/18
Posts: 2
Loc: TN
Remember to always make sure you have at least 12.6V on a battery after it has settled down from being unhooked from a charger to be 100% charged.

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