[prkaye]

Where is the preferred location on the engine to attach the ground cable?

 

[noelf]

What engine do you have??

Newer Lycoming's have a big 'ol bolt hole near the dipstick tube boss for the large gnd wire/cable connection. Remember, this wire carries the starter's return currents

 

[prkaye]

It's an overhauled O-320. I don't think it's a newer one...

 

[f1rocket]

I've always used the closest bolt/stud/nut on the back of the engine case that had a good connection to the case. I'll be interested to learn if that's a problem.

 

[rv9av8tr]

Engine ground point

This is how I did mine. Scraped the paint off the case to bare metal under the bolt head.

http://www.mykitlog.com/users/display_log.php?user=n539rv&project=161&category=3629&log=61931&row=8