XJ owner: Electrical/wiring question: Originally the negative on the battery runs to an engine bolt and another runs from the engine to the frame. Is this 2 step necesary, or can you run the negative from the battery direct to the frame. I'm a noob when it comes to wiring, as you already noticed.Thanks for your input.
Intelligent Tinkering: All major components of any vehicle using a negative-ground battery system need to be electrically "bonded" even when steel fasteners hold them together. This is typically done with braided stainless steel or tinned copper strapping meant to last the life of the vehicle and capable of withstanding vibration over many years where copper wire would get brittle. This is done to make sure that large metal items like engines or car transmissions do not become energized accidentally when isolated from the ground. The result can be sparks and welding of components, and it can lead to fires and other hazards. It can also prevent safe and normal operation. So an engine wouldn't run right if the ground strap were missing or damaged making it isolated from the ground, because the plugs wouldn't arc, and so on. You can buy new ground straps in various widths and lengths.
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