Edis ground
Turbo Mini Forums

Just wiring the Edis and megajolt up and pondering all these seperate earths I seem to have.

This is the cheat sheet I cobbled together mainly from the autosports site.

This is what the connector actually looks like.


All the literature recommends earthing the MJ and EDIS at the same point.

So the plan is; EDIS is in the engine bay and MJ up in the cabin with the common earthing point in the bay next to the EDIS. I run PIP and SAW up to the megajolt, IGN GND goes straight to the common earth next to the EDIS as with PWR GND.

But where should I terminate the cable shield (green) 1 & 2? I can't understand why they go on to pin 7. If they're acting as Faraday shields, and they both go on to pin 7 does that mean pin 7 goes to earth inside the EDIS?

Yes, pin 7 acts as the earth for both cable shields. You don't need to earth the shielded cable at the other end. I have tried earthing the shields on both ends before and it caused huge noise issues on a mate's car.

Your plan about where to put the earths sounds fine.

As Carl says, do NOT ground at the other end of the shields, only at the EDIS end.

Looking at your photo of the cut-off cables, Ford obviously had a different grounding regime but you should use new shielded cable(s) starting as close as possible to the EDIS and grounded at the EDIS pins (7 and 9 in the diagram) which are then wired to the same ground as the MJ as shown in the Autolabs diagram.

Schrödinger's cat - so which one am I ???

So just to clarify, see how the shielding is essentially pin7. Does 7 need to be connected to ground; or is 7 itself a ground?

The way I'm imagining it is any induced current in the shielding goes on to pin7 and in to the EDIS where it then does some fancy subtraction to remove the noise. So I don't need to do anything with pin7 and the shielding?

To splice, or not to splice; that is the question!

Yes pin 7 is an earth for the shields. All you need to do is splice more shielded cable on to your current pig tails, connecting the wires as you see fit and soldering the shields together.

Or, you can replace the shielded cables completely with fresh and earth them through pin 7 like it is currently on the photo. With fresh cable there is less chance of noise getting through as there is no gap in the shield.