So agreed. Engine, body, and frame are the same contiguous ground; regardless of OE intention.Yes, and tailshaft and bearings to axle etc. The point is that ground is via engine and body. Frame/chassis may have indirect grounding, but is not used as a ground path.
As I thought, we're on the same page.
Respectfully, and I bet you would agree, the average EE has never touched a DVM, DOM, or (these days) a vehicle aged 1995 or older.I've got a pretty good grasp of ground loops - my EE work ensures I understand that along with circuit design and board layouts.
Fusing is what it is. Agree that it's right or it's not, implementer irrelevant.
Happy to share my wiring schema if you have any questions.