Alright, this is driving me crazy. I've been looking for the firewall ground (from the grounding guide in the archive), the one that you ground the trailing coil to, and can't find it. I look at the picture and can't find where it is in the engine. Help, please?

 

Trailing coil does not ground through the firewall.
The trailing coil actually grounds through it's metal bracket.
There is a capacitor that damps the switching noise from the toggle function, but this is not connected to the firewall either - this capacitor is grounded on the backside of the driver's side strut tower.



-Ted

 

I mean the firewall ground that is used for the new additional ground.

 

I think you've been misreading the FAQ. As Ted said the coils ground to the chassic throough their brackets, so IMO "grounding" them is pointless.

There is a thin ground wire on the firewall that connects to the back of the engine (it's the only one, hard to miss). I simply added another 8GA wire in parallel with it. I saw no need to actually remove the original wire.

 

Yup, got that wire you're talking about. I guess it does sound kind of pointless to ground the coils. Guess even archives aren't infallible.

 

The only firewall ground I have is from the AM antenna to the top of the transmission. Learned of this when i had my windshield replaced.
Is this the thin ground wire you are talking about?

 

The only ground point I know of on the firewall is a 1/4" male spade connector near the windshield wiper motor.

 

This is the AM antenna ground from the built in antenna in the windshield!

 

[QUOTE=NZConvertible;3886817]I think you've been misreading the FAQ. As Ted said the coils ground to the chassis through their brackets, so IMO "grounding" them is pointless.

I just looked over the wiring diagrams in my 88 manual, I don't see any grounding through the wiring for the coils!

So, it is good to know that they both ground through their mounting brackets.

So, the bracket mounting bolts that go into the chassis are the grounding points!

That being said, these brackets and bolts need to be cleaned and make good ground contact for the coils!

What do you think?

 

On my S5, there's a short wire (~ 8-10") bolted to the bellhousing at one end and attaches to this 1/4" spade connection on the firewall near the windshield wiper motor. I don't think it has anything to do with the antenna. I think it's there for the purpose of trying to avoid any ground loops.

 

[QUOTE=gsmithrx7;12604599]If you are really concerned about the grounding of the coils enhancing what is there won't hurt any. I personally think, this is a net benefit.
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[QUOTE=Jeff76;12604648]I was out there today detailing my engine bay and looked at both coils. It is a simple thing at this point to take off the brackets and clean the bolts and the bolt holes. Take all of twenty minuets, use my conductive electrical grease instead of anti-seize lube, and it will be one less thing to be concerned with.