Electrical ground accessible from service panels? (Elise S2)

[Douvre777]

Hi all,

Currently in process of installing a sub into the car.

Looking for a suitable post to provide a ground that's accessible from either of the two front service panels.

I've not managed to find anything obvious. Tried looking at the pic from the link below but it confused me more...

https://www.lotustalk.com/threads/engine-cut-out-d...

Anyone with an early S2 got any ideas? Thought I'd try my luck outside of the car audio specific thread in case anyone's installed a dashcam or some other kinda gadget.

Cheers.