Wiring a 3 Liter into a 69 911. Tips?

rennch · rennch's Garage

Hi...I previously had my 3.0 in my 72T. I have now switched cars and need to wire up the 69 with the same motor that had the mods for the 72. The biggest difference with the 69 is the lack of the plug on the left side of the engine compartment. Everything is essentially hardwired to it's proper spot. The 3 liter still has the 14 pin (I think it's 14...it's not in front of me at the moment) plug, but I need to split it up to wire it into the car. Any suggestions on how to wire it, or cool wiring ideas would be greatly appreciated. I *think* I have a nice color-coded wiring diagram around somewhere...I have to track it down. To complicate things, I'm running an MSD 6AL with an MSD Coil.

If anyone is a wiring guru and wants to come to Boulder this week, Pizza and beer is on me!

DW SD · 05-08-2006, 02:22 PM

Why not retain the 14 pin connector and adapt the existing harness to mate up with a 14 pin connector to your engine? IE add the connector to your chassis.

The connector in my car was stripped down to about six or seven connections (out of a possible 14) during my '95 3.6 transplant. At the connector you have one or two extra power coming off of the alternator to drive relayes, blower motors, rear windshield wiper, reverse lights, maybe a trigger for turning on the AC compressor, etc. For a simple car, many circuits are not necessary.

Most of the sensors (oil idiot light, temp, pressure) are wired through the 14 pin connector, as is starter and the alternator idiot light. In other words, you only need about six or seven wires to get it to run properly.

Doug

rennch · rennch's Garage

HI Doug,

Thanks for the info. I'm thinking the same thing...but the other half of the connector went with the 72, unfortunately. I included it in the car when I sold it. I was thinking of doing something like that though. I might just get it to work first before I figure out the best way to route the wires.

I thought of doing a modern fusebox back there as well.

DW SD · 05-08-2006, 02:55 PM

It is a lot easier to wire when the engine is out, my experience.

You can buy new 14-pin connector kits relatively cheaply from Pelican.

You could also track down a chassis wiring harness from a dismantler or Pelican who is parting their car, probably quite cheaply.

Doug

rennch · rennch's Garage

Ok...I made some good progress.

I DID end up pulling the engine...at least I lowered it.

I had access to the rear plugs, and wired up the MSD unit. I have a couple of questions though...

1. There is a regulator on the side panel. I have a newer Alternator with a built in regulator, so I'm assuming I don't need it.

Also, there's what they call the "Governer". Do I need this if I'm using the MSD? I was assuming it was the CD box. The Porsche part number on it is 0 336 611 006. If I need to wire it up, I don't have a plug for it, and I'm going to have to wing it.

Thoughts?

DW SD · 05-08-2006, 09:44 PM

HMMM,
I know the 3.2 and now the 3.6 system a bit better. My guess would be the output of the alternator (heavy red wire) ties into the charging system at the large post on the starter. I doubt the governor would be kept tied in, but I cannot be sure.

Can you find a wiring diagram for the 3.0 and copy that? Essentially, that is what you are trying to end up with. Jim Hamilton documented the electrical conversion of his early to 3.2 transplant. That would offer some clues: www.addictionmotorsports.com

I think the SC wiring diagram would shed the most light.

Doug

DW SD · 05-08-2006, 09:45 PM

http://www.addictionmotorsports.com/WiringHarness.htm

This link sheds light on the wiring of the 14 pin connector. I know it is different than your application, but at least you get the idea of what the wires are for. The wiring scheme and color scheme is amazingly consistent through the years.

Doug

rennch · rennch's Garage

Thanks again Doug!

I'll hopefully make some more progress tomorrow.

dkm_chgo · 05-09-2006, 03:11 AM

Hi,

You can check out this thread:

3.0 into 69 911E woes

Hope it helps.

rennch · rennch's Garage

It does...I checked it out yesterday and made some great progress because of it. Thanks for the tip!

rennch · rennch's Garage

I'm having a hard time finding the exact right wiring diagram for the 69T. The nice ones on that site don't seem to match up exactly, unfortunately. They still want a 14pin connector, which I don't have.

At any rate, I think I'm getting there. I just have to wire up the yellow and red thick wires, and I have to find the right spot to tap them into. I'm going to hook up my starter and get them in there, and see what happens from there.

rennch · rennch's Garage

Ok guys...I'm making pretty good progress. I think I'm almost there, wiring-wise. (At least to fire it up)

Quick question: What does the ground wire that attaches to the Coil bolt connect to? I can't seem to find it.

Thanks.

rennch · rennch's Garage

Ok...I'm wired, but not sure I'm right. I decided to use the '79 wiring harness from the starter to the engine compartment, and try to tap into the '69's stuff. I'm not getting the starter to fire at the moment, so I'll try to describe and post some pics.

The main yellow and red wires from the starter come into the engine compartment. I have the main red wire tapped into the main power block on the left side of the engine compartment. Then the small red and yellows split off to an ignition relay on the left side in that power block.

Below are some pics to help describe the situation a little better. It would be REALLY helpful if someone has wired up a 69 with a later model engine, because the 69 is totally unique.

rennch · rennch's Garage

Still need some help folks...any input appreciated!