27 kohler not charging

Discussion in 'Mechanic and Repair' started by Jimslawncareservice, Mar 23, 2014.

  1. Jimslawncareservice

    Jimslawncareservice LawnSite Platinum Member
    from mn
    Posts: 4,128

    have a 2005 exmark navigator with a 27 kohler. it runs after I charge the battery or jump it. but after a few hours of running it, it drains the battery. any ideas what it could be? I am not real savvy with engines. anything else wouldn't be a problem. thanks in advance
     
  2. Penscape Landscaping

    Penscape Landscaping LawnSite Senior Member
    Posts: 359

    You need a rectiifier I believe. It is mounted on side of engine with plug going into it. About the size of matchbox with 4 plugs. Keeps your battery charged while working.
     
  3. Jimslawncareservice

    Jimslawncareservice LawnSite Platinum Member
    from mn
    Posts: 4,128

    I will give that a try
    Posted via Mobile Device
     
  4. mdghs

    mdghs LawnSite Member
    Posts: 39

    I don't know if I will be of much help but I too have a 2005 Navigator 27hp and had a similar or the same issue last season. My battery would go dead about every 3 days. I would put the charger on it every night so it would stay charged and start for the next day. I also unpluged the hopper fil system so it would not draw the battery down as fast. I knew it was not the battery cause I changed batteries. I planed trying to figure it out over the Winter when I had time to work on it. I found that a 20amp fuse was blown. I replaced it and the charging system is now working. I tested it with the volt meter and it tested around 14.7. I think that was the problem or hope it was. I will find out when I start using it day to day when the weather gets better. I do not why the fuse blew so that has me concerned. This may not help you much but I hope it helps you find your problem.
     
  5. Jimslawncareservice

    Jimslawncareservice LawnSite Platinum Member
    from mn
    Posts: 4,128

    I certainly will check it out as well
    Posted via Mobile Device
     
  6. Exmark PR

    Exmark PR Sponsor
    Posts: 238

    The forum is correct in that it is a charging issue but it could be an issue besides a failed regulator/rectifier. We recommend you start by checking the charge fuse, the connections at the regulator/rectifier (don’t forget to check the ground), and the wire from the regulator/rectifier to the fuse/key switch. With the engine running at high idle, the regulator/rectifier should be outputting 13.7-14.7VDC – check voltage at the regulator/rectifier and at the battery; the stator should be outputting a minimum of approximately 38VAC. If you need any additional help, please contact Exmark Technical Service at 402-223-6375
     
  7. Jimslawncareservice

    Jimslawncareservice LawnSite Platinum Member
    from mn
    Posts: 4,128

    thank you. i'll check out everyones suggestions. if we can ever get some decent days.
     
  8. wahlturfcare

    wahlturfcare LawnSite Senior Member
    from iowa
    Posts: 532

    also, you have bad flywheel magnets that have damage your alternator. they were prone for doing that. I have repair 3 kohlers with that problem. I would do what jimslawncarservice says first and check for voltage output at the battery and rectifier.
     
  9. VegetiveSteam

    VegetiveSteam LawnSite Senior Member
    Posts: 297

    Really? I mean REALLY???? You have absolutely no idea what you are talking about.
     
  10. VegetiveSteam

    VegetiveSteam LawnSite Senior Member
    Posts: 297

    the stator should be outputting a minimum of approximately 38VAC.[/QUOTE]

    Just a quick correction. It should be minimum of 28VAC and might be as high as 50VAC
     

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