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Help on Minn Kota Trolling Motor Batteries - Walleye Message Central
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Old 09-27-2009, 05:47 AM
Micky Micky is offline
Join Date: Nov 2002
Posts: 5
Default Help on Minn Kota Trolling Motor Batteries

Hopefully someone can offer some help on this odd situation. I have a 24 volt Minn Kota Maxxum 74 trolling motor, a 24 volt system that is hooked up to 6 month old batteries. This morning when charging up after moderate usage on the water, I noticed that one bank of the on-board dual charger went green to a full charge in less than 10 minutes, but the second bank was in its normal charge mode with 4 red lights working down through its charging cycles. The batteries have had light usage since install. This condition may have been occurring in previous charges, I donít normally check after powering up the charger. This morning, it just happen to catch my eye as I was doing some work around the boat.

The trolling motor is working fine, but my understanding is that when in use, the trolling motor should draw down both batteries at the same time, thus both batteries should need to go through their longer charge cycles. Can anyone offer me some help on this anomaly? Thank you very much for your time and knowledge.
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Old 09-27-2009, 07:24 AM
cast_and_blast cast_and_blast is offline
Join Date: Jan 2003
Location: Minnesota, USA.
Posts: 1,078

Are you sure you're getting 24V? Check with a multimeter on the TM side (like at the plug). Sounds like you're either hooked up for only 12V or you have 1 bad battery. Does the TM seem weak?

If you previously had a 12V motor on this rig and didn't rewire the plug that may be a reason that you are only getting 12V too.

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Old 09-27-2009, 08:31 AM
boat nut boat nut is offline
Join Date: Oct 2006
Location: Saskatchewan, Canada.
Posts: 1,137

Its possible that the battery that wants to continue charging is low on electrolyte. If you have serviceable lead acid batteries (Minn Kota batteries are Trojans), make sure the electrolyte level is correct and fully covering the plaes in each cell. It's also possible that you have a shorted cell in the one battery. A fully charged wet battery will measure approximately 12.8VDC.
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