PLEASE HELP with 1976 911s Engine Harness

[1ricardo]

Dear Friends,

I have this 1976 911 that Iīm rebuilding, and today I notice that my engine harness is in bad shape with some odd fixes and some problems
Iīll divide the problems in 2 but I thing they are related by some how

1-) Where does this BROWN wire goes to?
On the alternator loom I have one connector that have 2 brown wires (if Iīm not wrong it goes on D-)
One of them is connected to the frequency valve plug and itīs in good shape
The other one itīs badly burn and itīs, just along the harness, interrupted and broken.
So, I would like to know where is the other end of the BROWN wire is connected?

2-) How do I fix this properly and where to connect those wires?
On the 14 plugs connector, some one solder together the wires 13 and 14 ( one blue and one brown
Also these wires are emended and then make a loop on the harness goes to the # connection plug ( pink Circle ) and they come back on 3 individual wires with female spades plugs that, by the time i disassemble the car was connected no where
So I would like to know:

2a-) Where those 3 wires are connected?
2b-) Do I fix the plug and desolder the brown and blue wire and put then back to the 14 plugs connector?
2C-) Iīm on the risk after doing this this brown wire burn again?

3-) Itīs possible that a Bad voltage regulator put that much strain on this brown wire at a point to melt it?


Facts:

- I recently bought this car and have no idea who made this "fixes" or why
- The car was running just fine prior I disassemble it
- The Tachometer of the car was very "Jumpy", so I thought that the voltage regulator was bad and bought a new one, but buy the time It arrived the car was already disassembled, so i had no chance to install it or check


Thank you all, so much in advance!

[gazzerr]

I'd just get timmy2 to make you a new one for reasonable $.

[timmy2]

Your photos are poor so wire colors aren't visible.
You shouldn't have a frequency valve on a '76.

This is what you want to end up with. (This is a '77 so one extra connector, but virtually identical)
PM or email me if you want an entirely new one made.

[timmy2]

Brown wires (grounds) run to the AAR plug, the safety switch plug on the back of the air metering plate, the WUR plug and the blower motor plug. Also one goes to the remote VR plug.

They are all connected in parallel routed all over the harness between those devices.

None go to the 14 pin connector

[1ricardo]

Hi Dennis

You are right, thereīs no frequency valve. I meant cold start injector, but that was incorrect too

This brown wire from the alternator (D-) goes to the WUR plug
And the other burned brown I still donīt know where it goes, i notice that it was routed toward the 14 connection plug
I uploaded a video on you tube so you can see the colors better

Hereīs

https://youtu.be/IiYVYWvn4L8

[75 911s]

My 75 schematic says the alt has two brown wires coming off. one to the WUR plug and one to the heater blower. *exactly as Dennis said :-)

[1ricardo]

LOL, I was not doubt Dennis, i just did not understand him very well ;-)

I donīt have a heat blower on my car, so Should I just disregard this wire? Also to be very clear is the heat blower that one that goes on the top of engine on its left side?
Here is a picture of mine engine already assembled with all its accessories

Also what about the two wires solder togheter?

[timmy2]

Yes, the heater blower is on left side. You can delete that ground wire and the fat yellow/black from pin 13.
It looks like the Brown from the Voltage Regulator plug is the one that failed.
Brown needs to go to WUR, safety switch and AAR as well.
I watched the video, someone relocated the blue and black wires from the VR and spliced in a blue/white and a black/white wire. (Not ever used in '76 Porsche engine harness) those are likely your mystery connectors.

[timmy2]

Show pictures of the back of engine and the passenger side. I want to see what devices you have for the CIS system. AAR (auxiliary air Regulator between intake runners on passenger side) fuel shut off safety switch on back of air metering plate are what I am looking for.

You appear to have an earlier year throttle position switch on the throttle body?
Is this a European version '76 or a system made from various parts from different years??

It is difficult to give advice not knowing what you have to work with.

[1ricardo]

Hello Dennis

Iīll love to buy a new harness from you and get rid of this headache, the problem is Iīm in Brazil and between the time the harness will take to get here (2 months in the post office for customs) and the 60% import duty over the invoice price, make it kind of difficult form me.
Thatīs why Iīm trying to fix what I have
Also I have more stupid questions, what s:
1- WUR ( this one I know, warm up regulator)
2- safety switch ? ( is this the one located on the fuel distributor plenum? My car does not have that
3- AAR ? That I donīt know
4- VR ( voltage regulator?)
Also Looks like to me that my voltage regulator itīs not even plugged on! Itīs that possible? Since the brown wire that starts on the 3 connector itīs solder to the blue one near the 14 connector them goes along the harness to make a loop and came back as a blue with white stripe that is finally not even connected when the car was working

[1ricardo]

Iīll send the pics

The car was bought originally in USA, but I have no idea what they did with the car along the years...

[1ricardo]

More pics

[Dpmulvan]

What kind of engine stand and yolk are those? Your resto looks nice bet you can't wait to get behind the wheel.

[1ricardo]

Stolen ones... LOL
I donīt know, I borrow from my mechanic months ago.
Yes thereīs alway some anxiety to get it finish, but I struggle with it and trying to do my best and not cut corners :-)

[Walter_Middie]

Looks like to me that my voltage regulator itīs not even plugged on! Itīs that possible?

Your car originally had an external Voltage Regulator (VR). The newer alternators now come with an internal VR and you have to disconnect one of the wires (black DF) to make it work. The old external VR is left disconnected or removed.

Alternator w/ external regulator convert to internal regulator?

[1ricardo]

Hi,
I donīt think it my case, Iīm using the original alternator with the external VR

[timmy2]

Nice photos.
No fuel pump shut off Safety switch visible. No AAR for extra air on cold starts installed.
You have a later throttle body from an 1980-'83 and that explains the throttle body limit switch.
Your car may have been running only on battery if the VR was disconnected.

As far as getting a new harness is concerned, In your fuel line thread, if you are ordering from Pelican, will you have to wait 2 months in customs for a fuel line?
Is it possible to ship only as the harness parts cost for value? Labor charged separately to reduce time in customs?

[boyt911sc]

Originally Posted by timmy2

Nice photos.
No fuel pump shut off Safety switch visible. No AAR for extra air on cold starts installed.
You have a later throttle body from an 1980-'83 and that explains the throttle body limit switch.
Your car may have been running only on battery if the VR was disconnected.

As far as getting a new harness is concerned, In your fuel line thread, if you are ordering from Pelican, will you have to wait 2 months in customs for a fuel line?
Is it possible to ship only as the harness parts cost for value? Labor charged separately to reduce time in customs?

Dennis,

Ricardo's engine is made up of different CIS components from different years plus a missing AAR vacuum system. From looking at those pictures, the throttle body is not from the late '80~'83 SC's but from pre-'76. Take a close look at the shaft on the TB. That is where the TPR (throttle pressure regulator) for '75 and early CIS. The 'pope rubber boot' is from another era. I wonder what is the WUR and FD on this engine.

BTW, I will be going to Rio de Janeiro in mid-March 2017 and could hand carry his engine harness if that would help. Either mail it to him or pick it up at my hotel. Did he (Ricardo) ever run this engine before? I even have some doubt if it would start at all (?). Good luck.

Tony

[timmy2]

Hi Tony
You are the CIS guru, so I believe you on the Throttle body.
Definitely a compilation of different year CIS parts.

Nice of you to offer to deliver a new harness to Rio and avoid all of the hold ups of importing for him. You continue to amaze me with all of your globetrotting over the past few years.

That would be up to Ricardo to arrange. At this point he hasn't asked me to build him a new harness. I know you would deliver on your promise to take it there, as you are a man of your word.


I don't know any more than you or anyone else reading this thread as to the status of the engine. He claims it ran without the VR hooked up, is all I have read.

[timmy2]

Ricardo,
Think about Tony's offer to mail it to you from his hotel, or have you pick it up from his hotel once he is in Rio in March. (Faster and cheaper than what you described!)

Happy to send it to him for you. I have sent him other peoples harnesses for engine rebuilds in the past.