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Battery ground and engine ground location

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  • #1

    Battery ground and engine ground location

    Is everyone OK with grounding battery and engine to the firewall? Also, lycoming O360, best place for ground wire location on case? Forward at starter? Or shorter run at rear of engine? Thanks all. Gary
    Tags: None
  • #2
    You can see what I did here: https://bearhawk4place.blogspot.com/...al-system.html

    Battery, Firewall and Engine case all together. 0 ohms.
    Rob Caldwell
    Lake Norman Airpark (14A), North Carolina
    EAA Chapter 309
    Model B Quick Build Kit Serial # 11B-24B / 25B
    YouTube Channel: http://bearhawklife.video
    1st Flight May 18, 2021

    Comment

    • Chewie
      #2.1
      Chewie commented
      11-20-2021, 08:14 PM
      Editing a comment
      Is that poly lacing you used essentially mil spec dental floss?
    • robcaldwell
      #2.2
      robcaldwell commented
      11-21-2021, 09:31 AM
      Editing a comment
      Yes. Polyester wire lacing.
      Last edited by robcaldwell; 11-21-2021, 09:35 AM.
  • #3
    You want them all going to your "star-point" earth, meaning that all earths for everything return to the same point. I just put a bolt through the firewall with the battery, engine earths, and a copper bus for all the avionics earths all connecting to it. A short cable from a stud on the accessory case to the firewall "star-point" is the obvious choice.

    Comment

    • #4
      Thanks guys...as usual!!!

      Comment

      • #5
        I did the exact same. I know grounds are usually an afterthought, but it is the ground connections that corrode the fastest by far. It is usually the ground connection that fails first.

        Comment

        • #6
          This link below is a product that complies with recommendations above. A variety of sizes are available.
          Ground Block 24/24-Tab Firewall Kit - B&C Specialty Products
          https://bandc.com/product/ground-block-24-24-tab-firewall-kit/
          Discourage those pesky (and “noisy”) electrical gremlins and ground-loops by using our Ground Blocks as a centralized grounding system. These are hand-made from .04” flat brass stock, sheared to size, with 24 or 48 Fast-On tabs securely soldered into place. Ships complete with installation hardware—brass bolt, nuts, internal-tooth lock washers, and spacer washers to accommodate any thickness of firewall. Most projects will require a single 24-point Ground Block on the cockpit side of the firewall; “loaded” electrical systems may require the 48-point block. A full “firewall ground kit” is also available in two sizes for composite aircraft needing ground points on both sides of the firewall. Choosing A Ground System: Most projects can do the job with a single, 24-point ground block on the cockpit side of the firewall.  Many electrical accessories forward of the firewall get an electrical ground by virtue their mounting on a metallic firewall - OR - grounded through a mounting on the engine.  Only projects with a very busy electrical system will need 48 grounds behind the panel. Airplanes with composite firewalls need some ground points on the forward side.  The full-up firewall ground kit includes a long brass bolt with sufficient brass washers to shim between the two ground blocks on a thick, composite firewall.  Single ground blocks are shipped with a shorter brass carry-through bolt, washers, and nuts for sheet metal firewalls.
          Brooks Cone
          Southeast Michigan
          Patrol #303, Kit build

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