Hi,

I want to make sure all my earthing points under the bonnet are clean and working, as I want to eliminate this as a cause of intermittent rough running and the injecter light coming on.

The battery negative is bolted to the engine, near the alternator.

Otherwise, I just see two earthing points, one behind each headlamp.

The battery side one looks to go somewhere towards the battery tray.

The ECU side one has around 4 wires bundled together, which emanate from the wiring loom.

What I expected to find, from my online research is an earth strap connecting the gearbox to the inner wing. However I can't see anything like this.

It's an early, 1993 899 car. Should it have one?

Cheers.

Quick answer is no. My 899 broke an earth lead, so I put another in as well as the first.

Battery earth goes from battery, earths against the inner wing on the suspension turret, then onto the engine.

Just buy a ready swagged bit from halfrauds. Attach to the gearbox mount on the other side, then bolt it to the gearbox.