In my BulletProofing class, we talk about electrical grounding..
Run ground wires appropriately, AND direct wiring, as insurance.
Redundancy runs aircraft, and racecars.
Use stainless steel star washers, anti-seize compound, and any other tool which adds strength to your system.
Make sure rubber-mounted engines have effective ground cables, or yours could be another statistic in flaming failure.
bad connections kill starters, Ignitors, solenoids, fuse Holders, batteries, and people.
If you don't know electricity, think of flow and pressure..
a bad connection is a flow restrictor, can generate friction heat, waste otherwise useable energy,
..and can ruin an otherwise Sustainable relationship or demonstration.
Gee.. I wonder if I could explain that to my in-laws this way. naaah.