Question about Garmin Minn Kota MK 440 On-Board Charger CHARGERS

9 Answers

My problem is that I'm not exactly sure that I am charging correctly.Even if it is plugged in all night the yellow charge lights never go off unless I unplug and replug the 110v input plug quickly.It acts as if something gets reset inside the unit. As soon as i do that- the green charged lights come on.What gives.I have a Minn Kota 2 bank MK 25 charger (around '95 model)

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  • warrenh3859 Aug 28, 2010

    What does that really mean? Is it not putting out voltage or not putting out current? What am I supposed to watch for at the end? Why does quickly unplugging the 110v reset something or allow the charged indicators to go to green from yellow? Help?

  • warrenh3859 Aug 29, 2010

    I really think that if I leave it plugged in too long that would be overcharging for sure. I mainly want to know if these chargers have replaceable relays or not.Surely it must be some charged relay thats not kicking in to tell it to stop charging or not. Maybe its some sort of loose solder connection inside? What does anybody know about this.

  • warrenh3859 Aug 29, 2010

    Thanks tbreeze 47. Thats kind of what I already expected to here.Now I'm looking for someone to tell me if these chargers have replaceable or servicable relays or not. If they dont ,then I'll know what I need to do. 'Preciate you anyway.

  • warrenh3859 Aug 29, 2010

    C'mon any electronic techs out there. Surely someone might know about this symptom and a remedy.I really want to try to salvage this charger-I'm not from the throwaway generation. Help please.

  • warrenh3859 Aug 30, 2010

    What about the fact that after sufficient charging time whenever I quickly unplug and replug the 110v plug-- that the green charged lights both come on? Why would you blame the batteries when this happens? I would think this would point to the charger and not the batteries.

  • warrenh3859 Aug 30, 2010

    The problem is still there.I suspect the batteries are ok because the fact of unplugging the replugging the charger will instantly show green lights for charged.Its like the relay inside gets a surge of some kind then switches from charging to fully charged. Any Minn-Kota techs out there-or anybody else had this exact problem with theirs and what did you do to remedy the situation.help

  • warrenh3859 Aug 30, 2010

    Whenever the charger doesnt go from yellow to green then we can assume that its constantly pouring current into it-which would technically overcharge overnight-wouldnt it? Like boiling the batterys the last few hours or maybe more.Maybe it would be a battery problem- as if never getting up to full potential, then the lights never switch to charged mode.Whenever I change the leads to my starting battery I have found that it changes over to charged correctly as normal.Found this out just today.What u think?

  • warrenh3859 Aug 30, 2010

    Ok-I just found out today that whenever I switched over one set of leads to the starting battery then the charged lights switched over seemingly like normal-after just a 1/2 hr or so.Thats because that battery was almost fully charged when I started the process.Anybody leaning toward the batteries now?

  • warrenh3859 Aug 30, 2010

    Ok-new info from today.I switched one set of leads to the starting battery which was 98% full when I started and left the other set of leads onto a trolling motor battery. Of course the starting battery lights switched over to green charged withing a 1/2 hr or so like normal. Now maybe I'm leaning with your theory of poor batterys not accepting a full charge. I just bought the boat last year used and dont really know exactly how old the batterys are anyway.Let ya know.

  • warrenh3859 Sep 01, 2010

    How about this problem-any techs out there that have seen this EXACT situation and what did you do to EXACTLY correct it? Any takers out there? For starters-I'm gonna take one of my batteries tomorrow to get load tested to see what that will show.If it doesnt load test out ok then I'm gonna start with 2 new ones then see what that does to the charger.If they have a lightly shorted cell then I suppose it would act like a slight resistance while trying to charge.Thats the theory for now.Can anyone confirm this at all?

  • warrenh3859 Sep 02, 2010

    Ok-anybody want to weigh-in on this symptom? almost ready to trash the batteries- but I'm not 100% yet.They dont seem to take a charge but yet check out ok at Autozone!

  • warrenh3859 Sep 02, 2010

    Rockmeister-sorry but I didnt understand anything you just said. Do you have anybody that can translate what you mean in some other terms? What is the device-why do you believe that the charger is not the orginal to the boat-My goodness I have too many questions to this post-thanks anyway though. Its obvious that you are either a Mensa scholar that is trying to come down to layman terms It looks like I'm going with 2 new batterys after all this.

  • warrenh3859 Sep 02, 2010

    Ok-thanks I think. Can anyone translate what this guy is talking about.I am talking about a boat onboard (built in-came with the boat originally)battery charger that charges 2 batteries at one time-this is called a 2 bank charger. Its sort of pointing to the batteries themselves might end up being slightly shorted-not taking the charge.Thats what its pointing to. I still dont know what the heck rockmeister is talking about but thanks anyway for trying.

  • warrenh3859 Sep 05, 2010

    Well after much trial and error-I decided to remove the batteries one at a time and test THEM. Working on a theory of the indicators on the charger might be related to slightly shorted batteries not able to take a full charge. I swapped leads one at a time to the starting battery and the charger seemed to be working correctly. Swapped out for 2 new trolling batteries and seem to be good to go with the charging system again. Thanks for your help.Warren

  • warrenh3859 Sep 05, 2010

    After much trial and error -I decided to test the batteries individually.They had a slighly opened circuit indicated by not able to take a full charge.When I swapped out for 2 new trolling batteries-I was good to go.All along I was hoping for an actual MARINE TECHNICIAN to answer to tell me what my first thing to do was.I already knew ALL the other theories that everybody threw at me.I wanted an actual real life experience to come out and tell me what they had-so that I could go straight to my problem and not dance around with other work not necessary.No marine techs here I suppose. This website did not really help at all.Thanks anyway.I MIGHT still come back to this website later just to view what "experts" are telling people about their problems.lol

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9 Answers

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This light indicates you need to have the battery replaced.

Posted on Sep 02, 2010

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I don't think that the relay on the charger can be changed..but the thing is mainly that the voltage is not allow it to fully 100% charge it ..probably it charge it about 99 % ..and after you replug it ..it indicates the green light cause it sees it charged..
It might have nothing wrong but it is not able to switch from yellow to green when it reaches the voltage ...but it is able to recognize it charged when you first plug it and it is charged....It make sense isnt it ??
it might be just that ..If the devise indicator shows it charged after the operation ..I dont see any reason to change it ..cause it basically works ..

Posted on Aug 30, 2010

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When such a problem occurs couple of things you should first check are:
- The battery life of the device
- The recommended output of the charger and also what is needed by the device
If you are not charging correctly the charge light will not come on at all. Also if the green charged light comes on after unpluging and repluging does the device maintain a normal battery life? If you the charger you are using is not the actual charger that came with the device then such problems can be expected. Although it would be advicable to get the recommended charger for the device as this could damage the device battery.
Hope this solution has been helpful?

Posted on Sep 02, 2010

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Get load tested the battery and check out.But in most cases the battery needs to be replaced in this types of problems.Also if still the same problem with new problem then the further troubleshooting should be continued.But first the unit needs to be checked with new batteries and confirmed.
Check out.Keep updated.Thanks.

Posted on Sep 01, 2010

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Your batter is defective please replace you can order these batteries from garmin. Your yellow light stays on because your battery never receives a full charge.

Posted on Aug 29, 2010

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Hi.
These chargers are not replaceable or even have servicable relays

Posted on Aug 29, 2010

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There is a possibility that by unplugging and plugging the ac back in, that a relay changes state or resets, changing the status light. Would have to see a schematic of the unit to know, however. The main thing to worry about here, of course, is that the battery doesn't get overcharged, decreasing it's useful life.

There's nobody who knows this stuff like marine enthusiasts. I would talk to someone at a boat repair facility and see what they think. They could maybe let you know if this was ok or not. However, it would take a service manual and technician to correct the problem.
Good luck, and wish I had a better answer for you.

Posted on Aug 29, 2010

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Hello Warren. Your charger is on it's last legs. Replace it and you will be up and running again.

Posted on Aug 28, 2010

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Hello,

Check your craft for a steady current draw. Use a multimeter with the ammeter portion connected in series with the negative. Start pulling fuses until the display indicates a zero amp draw.

Something is drawing power, and the charger thinks that it is still charging the batteries based on current draw. When you unplug, and replug, it does a quick check for battery voltage, sees that it is acceptable, and terminates charge (green light).

Posted on Aug 31, 2010

  • Sheldon Dedek Aug 31, 2010

    Also, if your batteries are severely depleted, it may take more than just a night's worth of charging to get them up to a full charge again.

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