TBF the one on the bonnet hook is more of a RF signal supressor, but Its still earths out, its on the scuttle pannel on the left facing the car. I don't have a picture, but find any bolts near the bulk head and then bolt it onto the exsiting bonnet hook bolt. This one is usually flat and braided. I've always though as its close to the ECU mounting plates it must help if static feed back does come around that side of the bulkhead?
The main one which stops the loopback of static that can do damage if not working, is the one from your earth cable to gear box! Hence doubling it will act as back up if one is corroded and not making good earth contact!
I just tend to find continuity test on all cables if its not a clear bleep it needs cleaning or replacing!
