Wireing Gurus or Sages, HELP!!

[joeblow]

I am basically ready to fire my 5 year nightmare project (details soon to be told to the list), but I have a wiring issue.

The car is a 71' T and the engine is a 76' 2.7 CIS, BUT the CIS is gone and Webers are in it's place. I found some good info on the differences between the 14 pin connectors for both engines and have made the modifications needed there (pull two out and dis-guard and move one). What I have not found is info on the remaining plugs I have to hook up.

I have Workshop manuals in electronic format but they are not the best for electrical diagrams as they are on two pages and sideways!! I am unable to print them either since I am in the process of moving and my printer in in a container on the ocean.

I am running out of time to fire her up and could use some help guys.

Enclosed are the two connectors I am concerned with. The first is a two prong connector that has a matching on on the chassis which I assume belong together but I have visions of making smoke signals with that assumption so I wanted to get verification first.

The second is a little worrisome as I think it might be non-original? It looks like an H4 connector to me and has very non-Porsche colors (all solid). Can you guys confirm this is not a Porsche engine connector?

Assuming I am correct in the above statement, on an early car with carbs besides the 14 pin, there is just the CDI connector (3-pin plus ground) and the above mentioned 2-prong that come from the engine to the chassis?

I also enclosed a pic of two identical connectors coming out of the rear fuse panel area. One I am 90% sure is for the two stage rear defrost (shown plugged in), any ideas on the other one?

Last question. The 71' has a pin called Distributer signal on the 14 pin connector, no such match exists on the CIS harness. Can anybody tell me what that is for? I have two wires for the coil and two for the distributer inside the harness which seems to be what I need. Therefor I am not sure what this connection is for.

Thanks guys!!

[al lkosmal]

The three position connector appears to be for the external type voltage regulator.

[joeblow]

Originally Posted by al lkosmal

The three position connector appears to be for the external type voltage regulator.

Is that normal on a 76' CIS engine to be separate like that? It is embedded in the 14 pin connector on the 71'?

[al lkosmal]

I have a 71E and a 77S. My 77S has an external regulator. The 77 engine harness has a plug, just like the one you're showing, for the regulator. The 71 does not have this.

Regards,

Al

[joeblow]

OK, thanks that helps. I need to splice those into the 14 pin connector to get to the regulator.

Now I just need to figure out the other two connectors....

[MikeDL]

The 71' has a pin called Distributer signal on the 14 pin connector

I don't have a '71 wiring diagram handy, but I've been working on a 72 MFI wiring harness and they should be similar. What color wire, what pin of the connector is the "distributor signal"?

It may be the points signal that drives the MFI speed switch.

[joeblow]

Originally Posted by MikeDL

I don't have a '71 wiring diagram handy, but I've been working on a 72 MFI wiring harness and they should be similar. What color wire, what pin of the connector is the "distributor signal"?

It may be the points signal that drives the MFI speed switch.

It is actually listed as a Distributer Trigger on the 14 connector it is position 9 and is Black/Purple. Does that match anything you have?

[MikeDL]

On my diagram, black/purple is from distributor to MFI speed switch. I'm not sure about the pin but nine looks to be correct.

[al lkosmal]

On the 77S harness, black/purple is the tach signal.

Regards,

Al

[boyt911sc]

Originally Posted by joeblow

It is actually listed as a Distributer Trigger on the 14 connector it is position 9 and is Black/Purple. Does that match anything you have?

Joe,

The 14-pin connector for '76-'83 have basically remained unchanged over the years except for some minor differences in the circuit number. The black/purple wire is @ 12 (14-pin) unless someone has altered the connection/s. This is the wire that goes to the tach @ TD (chassis side wire harness) and to CDI @ TD (engine side wire harness) in the 14-pin connector. If your 14-pin is correctly set as per factory wiring diagram it would be easy to discuss and would be a plug and play situation.

See below how simple to test run a 3.0 liter engine on an engine stand if the 14-pin connection is correctly set-up: Plug and start sequence......

T. Conway's engine:


My son's (Alvin) engine shown running below:


The key to your success is having the 14-pin correctly set-up and less quess work will be involved. And your engine would run on a similar engine stand just like putting a light bulb in a socket. Keep us posted.

Tony

[joeblow]

Thanks Tony for the the encouragement. I am going battery on tomorrow and can do some more investigating....I just don't want to let any smoke out of those wires (an old Lucas wiring joke...the King of Darkness if you have ever owned a Land Rover you would know the meaning of this joke!).

[al lkosmal]

Joe,
You can do it. Follow the wiring diagram and it will run. Good luck with your project.

YouTube - 71E engine start1

YouTube - Porsche 71E resto, there is fire

YouTube - koz77911's Channel

Regards,


Al

[joeblow]

OK, I go hot today. One more quick question, there are two ground straps on the engine lid. The strap on the left side goes to the ground point on the inner 1/4 panel but what about the right side?

[joeblow]

OK Guys...UPDATE!!

She is ALIVE!

Took me 4 hours to figure out why I had no spark, turned out the perfectly good coil when the project started was not longer perfect ;(

I had a NOLOGY coil in a box so I used it, not exactly period correct but it fired immediately with it so on it went.

The engine made oil pressure immediately and only left a couple of drops on the ground to ensure I knew it was a 911

I did a 10 min quick tune on the Webers and got her singing pretty well and smooth idling at 900. She takes throttle well and sounds the part.

The dash is a mess, the paint shop completely misswired and misplaced nearly everything. Bulbs are on the wrong gauges and I assume all the plug in stuff is wrong too as basically nothing works. I did track down the oil idiot light and the generator lights before I ran her.

One issue I am having though that I could use some advise on in the voltage regulator. I think I have the wiring right but I might have made an oopsie as well. The car is making 15.5V at idle ad 16V at 3000 RPMs so obviously there is an issue. Any thoughts on that one?

Thanks!