Results 1 to 8 of 8
  1. #1
    New Member Dixie B6000's Avatar
    Join Date
    Apr 2011
    Posts
    20
    Tractor
    Kubota B6000

    Default B7800 40 amp alternator wiring???

    Ok i bought a new denso 40 amp alternator off ebay for my B7800. I saw a thread last week somewhere on how to wire it up and for the life of me can't find it now. I've fabricated up everything else just need to wire it. If someone could give me some insite or a link to a thread on how to do it and/or some PN's for a wiring harness etc... i would be much appreciative. Thanks

  2. #2
    Veteran Member
    Join Date
    Sep 2004
    Posts
    2,339
    Location
    Kansas, Butler county, Just east of DooDah
    Tractor
    Kubota L4200 GSTCA

    Default Re: B7800 40 amp alternator wiring???

    There are only a couple ways to wire an alternator...
    It depends mostly on the type of voltage regulator... is it internal or external?
    'Then how many connectors are there on the alternator?

    KennyV

  3. #3
    New Member Dixie B6000's Avatar
    Join Date
    Apr 2011
    Posts
    20
    Tractor
    Kubota B6000

    Default

    It has a internal regulator. Already took the factory installed external regulator off. The denso alternator has a terminal which i know goes strait to starter. It also has a T connector which has two wires. Not sure were these wires go. Im sure one is for the battery light but not positive which one and where to hook into the harness plug that the regulator used. Also there is a relay used in the plug and play wiring harness kubota sells. (Harness is $100 from my kubota dealer).

  4. #4
    Veteran Member
    Join Date
    Sep 2004
    Posts
    2,339
    Location
    Kansas, Butler county, Just east of DooDah
    Tractor
    Kubota L4200 GSTCA

    Default Re: B7800 40 amp alternator wiring???

    The Top of the "T" #2, is Switched 12volts... you (can use a relay if you like) ... it's not necessary as it will be switched with your 'key switch' anyway, and will only draw 1/4 of an amp when on...

    The leg of the "T" #1, is the indicator light ...It connects to a switched 12 volt supply for an indicator lamp...
    (if you have one).

    That alternator also has a test point labeled F where you can ground the field for a full field test...

    The B Large connector #3 is as you say routed to the starter Solenoid Battery post... You SHOULD put a 50 Amp fuse, circuit bkr Or fuseable link in that run...

    Nice little alternator ... KennyV

  5. #5
    New Member Dixie B6000's Avatar
    Join Date
    Apr 2011
    Posts
    20
    Tractor
    Kubota B6000

    Default

    KennyV you are the man. That is exactly the answer i was looking for. I just bought a fusable link at the parts store about 30 min ago :-) now i just gotta figure out where to hook in the #2 (switched 12 volts). Not sure exactly what the purpose of it is.

    Thanks Tremendously!!!

  6. #6
    Bronze Member
    Join Date
    Dec 2005
    Posts
    64
    Location
    South Jersey
    Tractor
    kubota l3430

    Default Re: B7800 40 amp alternator wiring???

    any pics of this install? denso part#? I would like to do the same thing.

  7. #7
    Bronze Member
    Join Date
    May 2008
    Posts
    51
    Location
    RI
    Tractor
    kubota B 7800

    Default Re: B7800 40 amp alternator wiring???

    I did an upgrade on my 7800 5 yrs ago I got everthing from the dealer was like 130.00

  8. #8
    New Member Dixie B6000's Avatar
    Join Date
    Apr 2011
    Posts
    20
    Tractor
    Kubota B6000

    Default

    Airmale, its better to just get the kit from the dealer. Its a bit of a headache wiring it up and is gonna cost you close to the same as fabricating it all up yourself. I think the kit was about $20 more after all said and done!

Similar Threads

  1. Everlast Welders - Welders and Plasma Cutters by Everlast
    By Mark @ Everlast in forum Welding
    Replies: 487
    Last Post: 04-04-2014, 12:57 PM
  2. B2150 40 Amp Alternator Set Up
    By aquetrac in forum Kubota Owning/Operating
    Replies: 11
    Last Post: 06-15-2011, 06:04 PM
  3. potential weak points on the 40 series
    By slan in forum Kubota Owning/Operating
    Replies: 14
    Last Post: 01-06-2011, 10:03 AM
  4. Replies: 25
    Last Post: 05-15-2008, 10:22 PM
  5. B7800 problem with starting and stalling- advice pleasee
    By Northland in forum Kubota Owning/Operating
    Replies: 9
    Last Post: 12-26-2006, 10:06 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.