81 911 SC into a 78 911 Carrera wirring

[ritter4242]

Well gentlemen, I am very proud to announce that I am in the final throws of my franken-Porsche. So for those of you who haven't seen my previous posts, I have a 1981 911 SC that was in a racing related accident (I was told it was crashed by someones son on a joy ride.. HA!) anyway I tried fixing the frame and got a very sad call from my mechanic (he really loves these cars) that it wasn't fixable... So long story short I began the look for a new body, which manifested in the form of a 1978 911 Carrera (yes the VIN says its an SC but there is no way it is, just trust me). SO I ended up with two cars that I knew nothing about, with an electronic and mechanical package I knew even less about.

I began on the stressful journey of installing an engine that belongs in a different car when I hadn't removed the original engine myself. So there are some wires floating around that I don't know where they go. I will try and organize this into two sections, 78 and 81.

78:
there is a green solid wire in the engine compartment that has a flat male connector on it, it comes out (from the back) on the right side of the engine compartment and seems to travel over to where the fuel system connects to the engine.

81: (this is going to get messy)
first off, there is a green wire connected to the K-jetronic electronics, it went to an open plug in the 81 so I'm guessing its for some testing apparatus and as such not necessary.

secondly there are two wires that go into the forward compartment, one was connected to the fuse box directly (solid red) and the other was wired into the wire harness (red with white stripe), and I have no idea what it is.


,
The first wire I'm sure should just connect to the fuse box, however I don't know where, but the second, red with a white strip, should, as far as I can tell, connect into this ( the wire under my thumb, coming out of the yellowish connector, it has a red and white strip wire coming in, and out of it):



however I don't have any wiring diagrams (nor the skills to use them). That was the set up it was wired into on the 81 and I'm guessing (not the best idea) that Porsche didn't change their wring codes as far as colors go..

So here is the fuse box for the 78, for reference



as always any help with this is greatly appreciated!

lastly, after moving the 81 repeatedly I have lost the bolts for the oil line I have the rear most mount, two of the rocker panel mounts and the right fender mount as well as the forward most mount (I had a moment of clarity and put the bolts back in their holes ) anyway, what size/length bolts hold the rocker panel mounts on? am I safe to only use two of the three mounts? also, is it worth getting the oil cooler? or should I just stick with the loop?


Thank you all, I really appreciate the help I have recieved from this site, with out it I would certainly have five blocks of metal in my shop and I would have to resport to the 'Jeremy Clarkson" method of fixing things

[ritter4242]

Have the wiring gods forsaken me?

[timmy2]

Originally Posted by ritter4242

Have the wiring gods forsaken me?

Yes..... You are being pretty vague....

Post a picture of the '78 green wire.

The '81 red/white wire could be many things. Need to have a "from-to" in order to identify it. Possibly Lambda related?

The bolts and rocker panel hardware are all in the Porsche parts Katalog.... search and ye shall find.

[timmy2]

Maybe the rocker panel bolts are here item 14?

[ritter4242]

Yes, I should have mentioned, any thing coming from the 81 is on the Lambda circuit (sorry) and it will be a couple days before I get home to take pictures. I wasn't sure if the 78's green wire was something that was known, like if someone had done an engine drop in a pre lambda car and would know what that wire was for. I didn't take the engine out so I have no reference as to where it belongs.
In my second picture I have my thumb on a blade connector that is the same color as the 81's (lambda) red and white wire and is in the exact same location (under and just inboard of the fuse box) and it was connected into an oddly shaped loop going into what I would assume is the same wire as pictured. The solid red wire for the 81's Lambda circuit was connected to the (my memory gets a tad vague at 3 in the morning) third (or fourth) from the rear wire on the 81's fuse box, however it did have a pretty gnarly rats nest down there and there were LOTS of aftermarket electronics on board (I can't count the number of times the alarm was set off in the dead of night) so who knows! Just as a side note, the right fender was pretty messed up so I can't properly trace wires in the 81. Thank you for your help, I'm sorry if I wasn't clear

[ritter4242]

forgot to subscribe to the post... I wish it would automatically subscribe.. x(

[ritter4242]

Alright! here is the loose green wire in the engine bay.



anybody know what this goes to?

[HelmetHead]

That looks to be the signal wire to the distributor.

[ritter4242]

So the body is a 78, and the engine is out of an 81, I don't remember unplugging a single wire on the 81? is this redundant in this system?

Thank you HelmetHead

[timmy2]

The green wire is definitely not the distributor coax wire as that only runs from the 6 pin CDI box to the distributor in the engine harness.

These should help you:
http://www.pelicanparts.com/911/911_Parts/911_electrical_diagrams.htm

[timmy2]

The only solid green in the schematic that makes sense for that area of the car would possibly be the feed to the rear wiper motor.

[LM3929]

sorry but that heavy green wire with that type connector would be used to activate the Clutch on the Air conditioner compressor.

Lorne M.

[timmy2]

If you look at the schematic, there are red/white wires from the front fuse panel and fuel pump relay all over the place....
My best guess is there was an alarm wired into the fuel pump relay circuit. I think you will have to do some wire tracing to determine where everything should go.
Good luck!

[timmy2]

You are probably right Lorne.
I didn't look at the a/c supplemental drawing last night.

[ritter4242]

sorry for the long updates (I have an Astrodynamics exam tonight yay) but I've solved the solid red and red/white wire issues the only remaining one is this green bugger, turns out the Bentley manual has wiring diagrams in it (really really nice ones too) HOWEVER my guess would be A/C, BUT it goes to the driver side of the car (A/C is on the passenger side) and since it's decided to rain at 27* I can't go home and fiddle, so I'm going to curl up with some beer and flip through the book.

Thank you guys I really appreciate it, I hope to get this car on the road before December, well able to go on the road in by December (two year mark)

[ritter4242]

Alright! the green wire is the AC system, the 81's connector had been replaced, for some reason. x)