Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> 3.0 to 914 6 wiring questions, just a few wires
rgalla9146
post Jul 8 2021, 07:48 AM
Post #1


Advanced Member
****

Group: Members
Posts: 4,671
Joined: 23-November 05
From: Paramus NJ
Member No.: 5,176
Region Association: None
I have a 911 SC engine harness that I want to modify to install its engine in my GT project.
The car has complete working 914 6 engine and chassis harnesses.
I have already eliminated all the SC fuel injection circuits and want to create a simple
plug-in engine harness for the 6 pin CD ignition and internal regulated alternator.
There are two wires on the CD unit I need advice on.
The 12v power is best sourced at what pin out of the relay board ?
The black/purple (tach pulse) goes to what pin into the relay board ?
The blue wire out of the alternator (charge light) goes to what connection on the relay
board ?
I'd rather keep the 6 relay board.
The coil, starter and oil press/temp are pretty well settled.
TIA
Anyone ?


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
 Reply to this topicStart new topic
Replies(1 - 12)
Mark Henry
post Jul 8 2021, 08:07 AM
Post #2


that's what I do!
***************

Group: Members
Posts: 20,065
Joined: 27-December 02
From: Port Hope, Ontario
Member No.: 26
Region Association: Canada
I can't help you, I deleted my relay board.

D+ will be the wire/connector for your idiot/dash light.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
peteyd
post Jul 8 2021, 11:19 AM
Post #3


Senior Member
***

Group: Members
Posts: 733
Joined: 27-March 08
From: Elora, Ontario, Canada
Member No.: 8,858
Region Association: Canada
We can build you a custom harness in shop.

Give me a shout if you're interested

Pete
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
roblav1
post Jul 8 2021, 12:39 PM
Post #4


Senior Member
***

Group: Members
Posts: 528
Joined: 18-September 12
From: KY
Member No.: 14,943
Region Association: MidAtlantic Region
There's all kinds of threads here on wiring. I know one is specifically for an SC engine. Some diagrams came from Auto Atlanta. I have hard copies in the shop. 1st question is your alternator internally or externally regulated?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mark Henry
post Jul 8 2021, 02:36 PM
Post #5


that's what I do!
***************

Group: Members
Posts: 20,065
Joined: 27-December 02
From: Port Hope, Ontario
Member No.: 26
Region Association: Canada
Just re-read the post, you may need two harnesses if using the factory CDI location. One to run to the relay board and the other from the dizzy (and possibly the coil) to the front of the battery tray.
My set up with weber carbs and MSD is done this way and it's very quick disconnect.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rgalla9146
post Jul 8 2021, 04:04 PM
Post #6


Advanced Member
****

Group: Members
Posts: 4,671
Joined: 23-November 05
From: Paramus NJ
Member No.: 5,176
Region Association: None
QUOTE(roblav1 @ Jul 8 2021, 02:39 PM) *

There's all kinds of threads here on wiring. I know one is specifically for an SC engine. Some diagrams came from Auto Atlanta. I have hard copies in the shop. 1st question is your alternator internally or externally regulated?


It's internally regulated.
I'm pretty certain I have the alternator wiring covered.
The big red(charging) wire goes to one end of the battery cable or the other.
The fat ground goes to the engine case.
The small blue wire for the charge lamp does not go through the 14 pin
connector.
I will extend a lead from the engine harness to the D+ female (no voltage regulator)
in the relay board.
The circuit then exits the relay board forward through pin 2 (blue wire) to the dashboard lamp.
With that connection I believe the alternator wiring issue is solved.
Input is appreciated
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
IronHillRestorations
post Jul 8 2021, 09:37 PM
Post #7


I. I. R. C.
*****

Group: Members
Posts: 6,792
Joined: 18-March 03
From: West TN
Member No.: 439
Region Association: None
QUOTE(rgalla9146 @ Jul 8 2021, 02:04 PM) *

QUOTE(roblav1 @ Jul 8 2021, 02:39 PM) *

There's all kinds of threads here on wiring. I know one is specifically for an SC engine. Some diagrams came from Auto Atlanta. I have hard copies in the shop. 1st question is your alternator internally or externally regulated?


It's internally regulated.
I'm pretty certain I have the alternator wiring covered.
The big red(charging) wire goes to one end of the battery cable or the other.
The fat ground goes to the engine case.
The small blue wire for the charge lamp does not go through the 14 pin
connector.
I will extend a lead from the engine harness to the D+ female (no voltage regulator)
in the relay board.
The circuit then exits the relay board forward through pin 2 (blue wire) to the dashboard lamp.
With that connection I believe the alternator wiring issue is solved.
Input is appreciated


This looks good to me.

You probably know about the extra green wire in the chassis harness, which you can use for oil pressure gauge. If you have the oil pressure sender on the front of the engine, you can pair the oil temp and press wires separately to the engine shelf and across to the front of the engine and it makes a little cleaner install. I just did a 6 conversion and made the harness more modular.

I'll try and confirm tomorrow but pretty sure power for CDI box is term#1, tach signal is term#2

Are you using a factory CDI box?

I use an injector style plug to connect to the distributor green wire, which is a coax cable. One side is the signal and the other the shield; both terminals connect to the CDI box.

The sucky part is the 6 pin CDI box boot is NLA and to my knowledge not yet reproduced
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
peteyd
post Jul 9 2021, 06:10 AM
Post #8


Senior Member
***

Group: Members
Posts: 733
Joined: 27-March 08
From: Elora, Ontario, Canada
Member No.: 8,858
Region Association: Canada
You mean this boot Perry? @IronHillRestorations

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
IronHillRestorations
post Jul 9 2021, 06:20 AM
Post #9


I. I. R. C.
*****

Group: Members
Posts: 6,792
Joined: 18-March 03
From: West TN
Member No.: 439
Region Association: None
QUOTE(peteyd @ Jul 9 2021, 04:10 AM) *

You mean this boot Perry? @IronHillRestorations

Attached Image


Yes! Who makes it?? I've got one NOS that I've been holding on to
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
peteyd
post Jul 9 2021, 06:28 AM
Post #10


Senior Member
***

Group: Members
Posts: 733
Joined: 27-March 08
From: Elora, Ontario, Canada
Member No.: 8,858
Region Association: Canada
@IronHillRestorations

One of our suppliers in Europe. I can't give all my secrets away.

Pete
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rgalla9146
post Jul 10 2021, 08:08 AM
Post #11


Advanced Member
****

Group: Members
Posts: 4,671
Joined: 23-November 05
From: Paramus NJ
Member No.: 5,176
Region Association: None

Next up is the tach wiring.
The 911 SC 6 pin CD plug has a black /purple wire that drives the tach.
The tach in our 914s is driven by a black/purple wire.
A 914 6 has a transducer on the relay board for the tach.
I don't know if a '77-'83 SC has a transducer ....anyone here know ?
Anyone with experience who can comment ?
Is an SC tach different ?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
roblav1
post Jul 10 2021, 08:10 AM
Post #12


Senior Member
***

Group: Members
Posts: 528
Joined: 18-September 12
From: KY
Member No.: 14,943
Region Association: MidAtlantic Region
http://forums.pelicanparts.com/porsche-911...lity-chart.html
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rgalla9146
post Jul 10 2021, 11:44 AM
Post #13


Advanced Member
****

Group: Members
Posts: 4,671
Joined: 23-November 05
From: Paramus NJ
Member No.: 5,176
Region Association: None
QUOTE(roblav1 @ Jul 10 2021, 10:10 AM) *

http://forums.pelicanparts.com/porsche-911...lity-chart.html


Excellent !
Exactly what I needed. (IMG:style_emoticons/default/pray.gif) Thank you !
Luckily I have a SC tach on hand to test and run temporarrily
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 27th December 2024 - 05:40 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...