Battery ground and engine ground location

[Gary Wallace]

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

[robcaldwell]

You can see what I did here: https://bearhawk4place.blogspot.com/...al-system.html

Battery, Firewall and Engine case all together. 0 ohms.

[Chewie]

Is that poly lacing you used essentially mil spec dental floss?

[robcaldwell]

Yes. Polyester wire lacing.

[Battson]

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.

[Gary Wallace]

Thanks guys...as usual!!!

[svyolo]

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.

[Bcone1381]

This link below is a product that complies with recommendations above. A variety of sizes are available.

https://bandc.com/product/ground-block-24-24-tab-firewall-kit/