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Thread: Confirm my battery connections, having a old guy moment...

  1. #1
    Join Date
    Apr 2015
    Location
    Denver, CO
    Posts
    214
    Boat
    '17 Z3

    Confirm my battery connections, having a old guy moment...

    I unhooked my batteries more than once last year without issue, however for some reason, hooking them back up yesterday just didn't feel right...

    '17 Z3 -- starting battery gets the starting positive and starting negative, those were labeled and easy, as well as the brown/white from the auto bilge going to the positive. That leaves the main bus bar positive, as well as primary (held on by nut) and secondary (post) grounds (labeled that way), all going to the maintenance. Is that right?

  2. #2
    Join Date
    Mar 2016
    Posts
    315
    Boat
    Tigé
    You are missing the ground wire (on the nut) that goes from cranking battery to the ground bus bar.
    It's dangerous to go alone! Take this.

  3. #3
    Join Date
    Apr 2015
    Location
    Denver, CO
    Posts
    214
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    '17 Z3
    That could be it, so there should be two grounds on the cranking battery?

  4. #4
    Join Date
    Mar 2016
    Posts
    315
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    Tigé
    Yes sir. One goes directly to engine, other to the ground bus bar. Its how the house system shares the ground with the engine.
    It's dangerous to go alone! Take this.

  5. #5
    Join Date
    Apr 2015
    Location
    Denver, CO
    Posts
    214
    Boat
    '17 Z3
    Ok, think I have it sorted now:

    Maintenance battery negative -- secondary ground on the post, amp ground under the nut
    Maintenance battery positive -- secondary positive under the nut

    Starting battery negative -- primary ground and starting battery to bus bar under the nut
    Starting battery positive -- starting battery to switch and auto-bilge under the nut

    Do I have it right now?

  6. #6
    Join Date
    Mar 2016
    Posts
    315
    Boat
    Tigé
    I believe you have it perfect now.
    It's dangerous to go alone! Take this.

  7. #7
    Join Date
    Apr 2015
    Location
    Denver, CO
    Posts
    214
    Boat
    '17 Z3
    Thanks, and this time, I have pictures for posterity...

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