Bonding is often ignored in DIY lightning protection setups, and that’s a serious mistake. All major metal parts of the boat—rails, tanks, engines, electronics—should be electrically bonded. If they’re not, a lightning strike can cause “side flashes,” where the current arcs unpredictably between components. This can result in fires or explosions, especially near fuel systems. https://marine.euthalia.com/en/homepage/