914-6 Engine Harness Wiring, CDI Connections Options

[DennisV]

I'm fumbling my way through the engine harness wiring for our 914-6 engine with CDI and Marelli distributor (no condenser). It's on a test stand at the moment, but I don't think that will complicate these questions. I have a new aftermarket engine harness.

Can anyone confirm or clarify the following:

1. Would the coil ground ring terminal (brown) go to the fan housing stud where the coil bracket mounts?
2. There is a ring terminal branching off the Points wire (black-blue) labeled CDI ground. AFAIK the ground terminals on the CDI are male spades. (IMG:style_emoticons/default/blink.gif) Not sure what to do with this. I guess I could try to fit it on the terminal retaining bolt? Or am I misunderstanding the intended location for this?
3. On the diagram I have there is a IGN_Coil_GND to CDI_GND connection (combined with Throttle_Position_GND). Do I still need to make a brown wire going from the Coil negative post to fan housing stud coil mounting bracket?
4. With CDI, there is no wire directly from the coil to the distributor?

Thanks.

[rgalla9146]

1 Yes
2 Black/blue w ring goes to coil
3 Yes, you need a short brown wire large (8mm) ring one end and small (5mm?) other
end. Extends from coil to coil mount stud.
The other coil mount stud gets a 8mm ring that is included in harness.
4 Included in harness 3 gang plug on CD

[rgalla9146]

Coil

[DennisV]

1 Yes
2 Black/blue w ring goes to coil
3 Yes, you need a short brown wire large (8mm) ring one end and small (5mm?) other
end. Extends from coil to coil mount stud.
The other coil mount stud gets a 8mm ring that is included in harness.
4 Included in harness 3 gang plug on CD

Thank you for your reply and the helpful photos Rory.

2. I probably didn't do a good job describing this. A photo will help.
The female spade connector in my diagram is labeled:
From: Points (black-blue)

The disconnected ring terminal is labeled:
From: CDI_Ground, To: CDI_GND (unspecified color)

This ring terminal on the left is meant to reach to the CDI and I need to utilize the terminal retaining bolt? I don't see where else it would go. Maybe it's mislabeled?


In your photo Rory, I only see a single wire on that CDI ground terminal. Which is what I have there now. The three pin female plug with a branch female spade to the ground terminal.

[rgalla9146]

Hey Michael
The ring terminal near the dizzy spade attaches to the chain housing cover stud
closest to the fan belt. It is a ground to the engine for the CD
One male spade on the CD remains vacant.
In the pic, bottom left of center you can just see the nylock nut that secures the
ring terminal.
Man, I have some cleaning to do.
Rory
The nut is clearly seen in your photo !!

[DennisV]

The ring terminal near the dizzy spade attaches to the chain housing cover stud closest to the fan belt. It is a ground to the engine for the CD
One male spade on the CD remains vacant.

Again, super helpful. Thank you very much!

[DennisV]

A follow up on this. I see a female spade connector that attaches to the distributor points terminal. It appears to carry two wires:
1. Black to CDI.1
2. Black-blue to 14_Pin.2

Where does that Black-blue terminate on the other side of the 14_Pin? I have looked at the main chassis harness, but couldn't figure it out.

This is a case where the test stand is complicating things, as I obviously won't be connecting the engine harness 14-pin connector to the relay board. So I'm assuming I need to jump that black-blue wire to something?

[IronHillRestorations]

A follow up on this. I see a female spade connector that attaches to the distributor points terminal. It appears to carry two wires:
1. Black to CDI.1
2. Black-blue to 14_Pin.2

Where does that Black-blue terminate on the other side of the 14_Pin? I have looked at the main chassis harness, but couldn't figure it out.

This is a case where the test stand is complicating things, as I obviously won't be connecting the engine harness 14-pin connector to the relay board. So I'm assuming I need to jump that black-blue wire to something?

It goes through the relay board, to the BHZ can, to the tach. As I understand it the BHZ can changes the signal from the points so it works the stock 914-6 tach properly. Later 911’s don’t need the can.

[DennisV]

It goes through the relay board, to the BHZ can, to the tach. As I understand it the BHZ can changes the signal from the points so it works the stock 914-6 tach properly. Later 911’s don’t need the can.

Thanks Perry. I take it BHZ is synonymous with the CDI unit?

For the purpose of my test stand, since I'm not wiring the tachometer, I can just ignore this black-blue wire and the 14 pin connector all together?

There is an adjacent black wire going from the points to the CDI that I assume is controlling the spark.