The white wire in a properly wired system will not be grounded at which of the following?

In a properly wired system, the white wire, which typically serves as the neutral wire, should not be grounded at the engine block. This is primarily to prevent ground loops and ensure proper functioning of electrical systems. When the neutral wire is grounded at multiple points, it can lead to a potential difference, causing imbalances and possibly dangerous situations, such as stray current corrosion.

When considering other scenarios: grounding the neutral at the source of power or an onboard generator is standard practice for safety, as it helps establish a reference point for the electrical system. Similarly, connecting the grounding (green) wire to the engine block serves to provide a solid ground, ensuring safety and effective operation of electrical components.

In the case of an onboard inverter, grounding practices can vary depending on specific designs, but generally, the inverter will have its own grounding requirements, which do not involve grounding the neutral wire at the engine block. Thus, the choice to not ground the white wire at the engine block aligns with best practices in marine electrical system design, maintaining safe and reliable operation.