Looking for the main ground on an e70 4.8l
 

Where would I find this?

Can we have some context? Why are you looking for this "main" ground cable"? What are you symptoms or issue(s)?


Everything electrical is grounded so there are ground wires & combs (connectors) everywhere. Examples are like X490 & X10012 in the pic below...and if you click the link you'll see the wiring diagram that shows how X490 is connected to a lot of electrical components around the car:




But there's also a ground cable that runs from the starter to the chassis which is #2 in the diagram below and is located in the engine bay: