Battery relocation - ground question

When the battery is underhood the negative cable goes to the engine block. The ground strap to the body is like 10 gauge and runs the accessories and lights.

When battery is in the trunk you NEED a large ground cable between the block and the body to run the starter. You don't have the battery cable to the engine block in this scenario. For the starter to operate you need both positive and negative to flow the same amperage.


I would use the grease you bough and a star washer on both sides of the connection to the body.