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Marine battery drain.

Post By: Gwill      Posted: 4/14/2019 12:23:26 PM     Points: 4315    
So this year I replaced my 4 year old trolling motor batteries because last year I noticed that a few days after a full charge my trolling motor battery meter was showing the level down to three bars. After installing new batteries I am seeing the same thing. I have a good 3 bank charger and always un plug the trolling motor and there is nothing else on the circuit. I also have a lite portable minn kota tester that shows the same battery drain. Any ideas?
 Reply by: skiman      Posted: 4/14/2019 1:07:30 PM     Points: 2329    
Sounds like it could be a short somewhere in the wiring harness or wiring. Is your boat aluminum? Fully charge your batteries and test them after a day or two. If they still have a full charge, that should tell you itís in your system or the batteries themselves are bad. Just a couple of ideas. Good luck. Ski
 Reply by: Hawaiian Punch      Posted: 4/14/2019 2:14:01 PM     Points: 7235    
Gwill . . . .a volt meter is your best friend.Ski hit the good points.I got nothing else to add.
Good luck and let me know if you are replacing any of the battery size wires. I got the heavy duty termanals crimping device.
 Reply by: fom      Posted: 4/14/2019 2:18:52 PM     Points: 5733    
You know I experienced a similar thing on my charge indicator on my terrova, a friend of mine who is a master electrician checked it out for me turned out the charge indicator on the motor was faulty. This might be some food for thought ,good luck stuff like that are very frustrating.

 Reply by: skiman      Posted: 4/14/2019 3:02:54 PM     Points: 2329    
I agree with fom on the faulty meter...a good point.
This winter, I had a 12 volt flasher battery do a similar thing. Registered 13+ volts on the meter, took it off the charger and the next day it had a reading of only 10.5 volts. Replaced the battery and solved the problem. Like HP said, a good voltage meter is your friend!
 Reply by: Ajax5240      Posted: 4/14/2019 4:58:13 PM     Points: 29465    
You have one of just a few problems, most listed above.

Other than the bad voltage meter on the motor.. you have some sort of a draw, or bad batteries.

As there is no load on the circuit, when you disconnect or connect the cable to the batter there should be no ďarcĒ or spark as some call it. If there is a noticeable one, you have an issue.

Official way to test that would be with an amp meter, checking how much current is leaving the battery.

Poor connections at the battery, terminal end on a cable getting lose, dirty batteries allow small currents to flow from post to post. All can drain a battery.

Hope that helps
 Reply by: Gwill      Posted: 4/14/2019 9:09:46 PM     Points: 4315    
Thanks for all the feedback. I will let you know what I find.