911 sc Wiring in process

[hellblau82]

Hey guys

Ive spent the day mapping my wiring out what relays I have available and cables I have no idea what they are...as you all know my harness was a bit of a Frankenstein and putting it out to you all to get feedback and answers on what I'm working with

[hellblau82]

[SpyderMike]

From another thread...pleasure disregard the circled item.



What you are looking at for the chopped harness in the middle of your diagram is most likely here. The right side is out the bottom of your fuse block section of your diagram. To decifer colors:

SW is black
GR is gray
RT is red
BL is blue
GN is green
WS is white
GE is yellow

The chopped harness is various lights.

So starting from the left of the fuses on your digram, the first three are fuse block 3 fuses 1-3, the middle 10 is fuse block 1 fuses 1-10, and the right 8 are fuse block 2 fuses 1-8. The image I have above is the end of fuse block 1 and all of fuse block 2.

[SpyderMike]

Here is most of fuse block 1 and fuse block 3 above together and the engine fuse block below that (again disregard the magenta notes from another thread).

[SpyderMike]

I would highly recommend a Haynes manual and a Bentley manual of you don't already have them. They present the electrical section differently and together they are a great resource.

[SpyderMike]

Here is my connections list that I made (for a 1985 3.2) as I disassembled all wires in my trunk. It might help you identify some:




The WHERE column told me where I found the wire or loom.

The column OLD LABEL refers to the fact that I just counted connections from the first position from the aft end towards the dash and labeled the wire or relay from that way forward initially. So for example 1T was the far most connection on the top of fuse block towards the dash. Position 19B would be the furthest connection forward on the bottom of the fuse block. There are more connections on top of the fuse block than bottom.

So, for example, for connection 1T, the OLD FUSE column tells me after research that this was actually fuse block 3 fuse 1 (3-1) and is for power windows - a black solid color wire of medium to large gauge (relatively speaking).

I did not focus on systems that I was not going to keep...power mirrors, A/C, etc. So that is missing. I rewired my car for minimal systems and for reliability.

It is not perfect, but it might help.

[hellblau82]

Ok great I think I am actually going to scrap the AC and heating myself
I'll keep working through what i have and workout what I need and what I don't need.
At the moment priority is to get the car to be able to start.

[SpyderMike]

What is important to remember is that most of the power runs through the heavy gauge red wires from the battery to the ignition switch. From there it is distributed to a few buses. I explain those here:

http://forums.pelicanparts.com/porsche-911-technical-forum/854546-understanding-ignition-switch.html

When you look at the fuse diagram I posted above, you will see reference to those buses on the left hand (power feed side) of the fuse block. They are right above the solid black lines which represent the buses (15, X, 30). Physically, this is the top of the fuse block. Power comes in the top and goes out the bottom. On the diagram above, power come in the left and out the right.

The 15 bus is powered in RUN and START ignition key positions.
The X bus is powered in the ON and RUN positions.
The 30 bus is always hot.

The looms are logically grouped for the most part.

[SpyderMike]

Focusing on just starting the car narrows things down quite a bit. I posted the question a while ago. Here is the list i came up with - for a 3.2:

Anyone have an idea what the minimum wires I need to power to get the engine running are?

DME
Fuel Pump
Coil
Gauge power
Starter

If you focus on these circuits and safety the rest, the you should get it running. You will need to substitute the DME function for your CIS. I found this to be a good resource for understanding that, there is an electrical section:

911 CIS Primer - Index

[SpyderMike]

I refer to an electrical bus as a shared connection point. For example, looking at the fuse block you will see that there are brass bars tying several connections together on the top. Those are shown on the fuse block diagram I posted as black solid lines. Heavier gauge wire bring power to the bus bar where it is shared by several fuses. Those bus bars are powered by different ignition switch key positions. The designations near them (15, X, 30) refer to the points of origin at the ignition switch.

[SpyderMike]

As an example. Please disregard the magenta and look at the red circled item.



This is a large (6.0) red (RT) gauge wire from the battery + terminal to the bus identified as 30. 30 is an always hot bus. The bus powers fuse block 1 fuses 1 and 2 (interior lights, central locks, hazard lights) and in some cases it is jumpered on the input side to fuse block 1 fuse 3 for the fuel pump.

Now, the other wires on the top (left side in the diagram) on the bus 30 (power window relay, horn relay etc) are also tapping their power off the bus unfused at that point.

Does this make sense?

[hellblau82]

Ok this makes complete sense now..

[hellblau82]

Spent a fair chunk on the day scratching my head and had some wins and some losses..started trying to map out the tunnel cable that is cut on my passenger side ..it is a RHD..so I can look at joining it up to the dash harness and so far is what I've found..
I'll look over your paperwork too mike to see if I can work some more out. Starting to feel a little satisfied today with the direction this is heading.
The question marks below I have not yet tried to trace if anything here is obvious guys let me know.

1-Grey---license plate light
2-Grey/red---Right Park light
3-Grey/blsack---Left Park light
4-Green/black---Left indicator
5-Black/White---Right indicator
6-Yellow---Starter
7-Blue--This is not connected in dash loom has crimp lug on it
8-Green/red--- oil pressure send
9-Green/white 1--????
10-Green/white 2--???
11-Black/green--thick gauge cable ?????
12-Black/green--thin gauge cable ????
13-Yellow/green--????
14-black/purple--?????
15-black--????
16-white/green--?????
17-white/black--????
18-red/white--?????
19-Red--???
20-Brown/red 1--????
21-Brown/red 2--????
22-Brown/red 3--????
23-brown/white--????

[gerakroo]

I hope this helps....

Blue = Alternator lamp
Green-white = oil level
Green-white = from rear light right to dashboard
Green-black = not rear light but oil press !
Black green = left indicator
Yellow-green = pin5 engine harness (back up light)
Grey-brown = pin6 engine harness (back up light)
Black-purple = RPM signal pin 12 engine harness
Black = rear window heater
White-green = left rear light to dashboard (heater switch)
White black = rear window heater
Red-white = fuel pump connector front pin10 engine harness
Red = Fusebox front to 2 pole connector engine harness
Brown-red = speed pick up gearbox (2 x )
Brown-red = 2 pole male connector engine bay to dashboard
Brown-white = handbrake

[timmy2]

Pull the 14 pin connector on the rear fuse panel to trace out a Lot of your question marks.
Here are a few to help get you going:
Green/Red-oil pressure
Green/Black-oil temp
Green/White-oil idiot light
Black/purple-tach
Blue-alt light
I may have time to look at my '82 through body harness later today for some others.
A number of them will terminate in the hand brake area as well. Also under the rear coupler area panel.

Never mind, looks like Gerald posted a complete list for you as I was typing mine up.
I'm not anywhere near my information, just going by memory...

[hellblau82]

Thanks guys I'm smashing through it now feel much better about it...looking at the 82 schematics from pelican also have helped even though they arnt in color the codes are on there...

Does that 14 pin connector come out ok?? Mine looks a bit fragile haha

[gazzerr]

Yeah it comes out - I got mine started with a hard nylon trim lever "spudge" and it came right off. The pins are quite large so it takes a little bit to loosen it up. You could probably use a screwdriver but be careful they can be quite brittle.

[hellblau82]

Is there a diagram or pin layout anywhere of what the connector should look like or what pin outs it is with color codes

[hellblau82]

Not sure why the black /purp isn't connected

[timmy2]

Where is the red wire going.
Somebody has been in there.... Msd perhaps?
Black/purple should go where that red wire that was added (poorly) by soldering to the top of the terminal.

From pin 14, bottom right in your photo.
14-red alt B+
13- yellow/black blower motor
12- Black/Purple CDI 6pin
11- Blue alt D+
10- red/white WUR
9- green/white idiot oil light sender
8&7 blank
6-grey/brown reverse light switch
5- green/yellow reverse light switch
4- green/red oil pressure sender
3- green/black oil temp sender
2- blank
1- yellow to starter solenoid