Calling electrical wizards

77carrerabt · 02-16-2011, 05:10 PM

Hello,
I am wondering if any one can help me identify these wires and what they control or plug in to? The fuse panel and harness are from a 74 911 S but the panel on my car is some what different. I have posted these pics to start because they are the smallest and seemingly the easiest. If any one has a pic of them attached and mounted in their prospective locations that would help also. Are there any wiring upgrades that can be done on the early 911 cars? Thanks for your time and help.

Zeke · 02-16-2011, 05:14 PM

My guess is fog lights.

Wil Ferch · 02-16-2011, 05:29 PM

I agree with Milt....from the length of the wires, the connectors used...and the fact that I took off the OEM fog lights and installed driving lights in their place, and had to fish the spade connectors back to their "stock" connection locations...and remembering the connectors looked like this. However, all for my 85...could be the same here.

77carrerabt · 02-16-2011, 06:44 PM

Quote:

Originally Posted by milt

My guess is fog lights.

Thanks guys, yes that part of the harness does match a new fog light harness that I have. do the fog lights "T" together and then attach to the female spade slots? Also, can you tell me what harness is for with the two large plastic rectangle and one ground
connectors. I can send another pic if you can not see it from the pics.
Thanks

Wil Ferch · 02-16-2011, 07:19 PM

Best bet is to work off of a factory wiring diagram. Don't forget, all lights require a "power-to" lead...and also a ground lead back...to complete the circuit. Porsche uses German DIN convention and brown wires = ground.

schumicat · 02-16-2011, 07:28 PM

the fog light power wire is white with a yellow stripe. brown wire is ground. it looks like that is what you are asking about but hard to tell from pics. each foglight has a power wire and ground wire that attach to the harness under the clear plastic covers.

77carrerabt · 02-16-2011, 07:51 PM

Quote:

Originally Posted by Wil Ferch

Best bet is to work off of a factory wiring diagram. Don't forget, all lights require a "power-to" lead...and also a ground lead back...to complete the circuit. Porsche uses German DIN convention and brown wires = ground.

I don't have a wiring diagram (dont know how to read one either.
That is why I asked for pics of these harnesses attached in place.you know a picture is worth a thousand diagrams some times

77carrerabt · 02-16-2011, 07:57 PM

Quote:

Originally Posted by schumicat

the fog light power wire is white with a yellow stripe. brown wire is ground. it looks like that is what you are asking about but hard to tell from pics. each foglight has a power wire and ground wire that attach to the harness under the clear plastic covers.

in permalink # 4 there is a pic. Are you saying that harness is for the fog lights? i have a brand new fog light harness # 91161202700 that matches the other pic I posted. but there is the last pic posted I am wondering about. There is also a single lead red wire with no ground and a single plastic housed spade connector on it. Thanks for any help

Wil Ferch · 10:25 AM

77carrerabt:

Although trouble-shooting and giving advice via the internet is (IMHO) dangerous...as there are still things that go wrong or be mis-interpretted....yes. The shorter of the clear connectors runs forward along the fender/hood opening channel...toward the driver's side foglight. The farther-out clear connector takes the same wire...and routes it across the car ( as I recall) across the front transverse bulkhead and under the front latch area.....to end up near the passenger fender. THAT connector picks up the 2 wires ( power/ground) from the passenger foglight. Both foglight wires go thru a rubber/booty grommet in the front/vertical wall section of the trunk, fender side in 2 places, on both sides of the car. I'll try to find pics.

Caveat.... I think this is about as far as we can go, as giving routing instructions for the remainder of all the other circuits...it is crazy to do over the internet. You really do need to get the factory wiring diagrams, and simply "trace" the line path to where stuff is connected. It's not all that hard to learn.

I'll try to add some pics of my previous 85 if they show anything helpful.

Wil Ferch · 10:26 AM

Some pics and commentary--->

first pic....look in front of fuse box for red arrow painted in. That is the "nearest" clear connector that has both ground and power lead attachments to the driver's side fog light-->

second photo next up...red arrow again showing alongside vertical fender wall, drivers side...for the nearest connector--->

third pic up next....yellow painted arrow...passenger side grommet to penetrate wall and allow passenger fog light wires to come thru and get connected. Same grommet deal exists at the driver's side to allow driver's fog light wires to enter the trunk area from outside. Driver's side grommet is in the same general area, but on the driver's side near the battery. -->

fourth pic.... yellow paint line....shows routing of harness, from driver's side to passenger side, open space area under the front transverse trim piece where the latch is. The "farthest" clear connector will probably be somewhere in this path before it makes the corner to the passenger side grommet -->

77carrerabt · 02-17-2011, 12:54 PM

Quote:

Originally Posted by Wil Ferch

77carrerabt:

Although trouble-shooting and giving advice via the internet is (IMHO) dangerous...as there are still things that go wrong or be mis-interpretted....yes. The shorter of the clear connectors runs forward along the fender/hood opening channel...toward the driver's side foglight. The farther-out clear connector takes the same wire...and routes it across the car ( as I recall) across the front transverse bulkhead and under the front latch area.....to end up near the passenger fender. THAT connector picks up the 2 wires ( power/ground) from the passenger foglight. Both foglight wires go thru a rubber/booty grommet in the front/vertical wall section of the trunk, fender side in 2 places, on both sides of the car. I'll try to find pics.

Caveat.... I think this is about as far as we can go, as giving routing instructions for the remainder of all the other circuits...it is crazy to do over the internet. You really do need to get the factory wiring diagrams, and simply "trace" the line path to where stuff is connected. It's not all that hard to learn.

I'll try to add some pics of my previous 85 if they show anything helpful.

This exactly the response I was hoping for. Thanks so much

Wil Ferch · 02-18-2011, 05:55 AM

77Carrerabt:

You're welcome.....but don't expect this to be the first in a series of responses to help with the ENTIRE wiring harness....if you don't make an effort to get a factory wiring diagram and some effort to understand them. Many if us here would be glad to help after such first efforts are done. The problem with doing this from a distance over the internet is the real possibility of errors and electrical fires....if for some reason this is not correct for YOUR car....

I don't want to come off as a crummudgeon.....but I've seen my share of Porsche electrical fires and they still scare me. Let's do it right....

PS--- I see you are continuing this question on another thread about foglight switch terminals and such....and I also see someone else giving you the same advice to get the factory wiring schematic. Good hint....it's available from this Pelican site.

BTW....what year is your car? There are many "upgrades" that can be made to these cars to lessen the fire hazard and to generally improve electrical reliability, but ya gotta work *with* us a bit to get there....

77carrerabt · 02-18-2011, 07:31 AM

Quote:

Originally Posted by Wil Ferch

77Carrerabt:

You're welcome.....but don't expect this to be the first in a series of responses to help with the ENTIRE wiring harness....if you don't make an effort to get a factory wiring diagram and some effort to understand them. Many if us here would be glad to help after such first efforts are done. The problem with doing this from a distance over the internet is the real possibility of errors and electrical fires....if for some reason this is not correct for YOUR car....

I don't want to come off as a crummudgeon.....but I've seen my share of Porsche electrical fires and they still scare me. Let's do it right....

PS--- I see you are continuing this question on another thread about foglight switch terminals and such....and I also see someone else giving you the same advice to get the factory wiring schematic. Good hint....it's available from this Pelican site.

BTW....what year is your car? There are many "upgrades" that can be made to these cars to lessen the fire hazard and to generally improve electrical reliability, but ya gotta work *with* us a bit to get there....

I understand and it is excellent advice about learning to read the wiring diagram.
I am not wanting the entire wiring harness pictured or explained just this one area.
The reason being that I have a 74 911 S WOR that has factory fog lights with a completely hacked aftermarket wiring job. I simply wish to put everything back to stock. It also has the rear fog light under the bumper and I would like to get that wired correctly. Everything works across the dash (as far as I can tell) but the pressure wahsers (large euro pump and raised turbo squirters) for the head lights. I will need assistance on that once I have figured out the fog lights. This is why I am asking for pics and not diagrams. I have the factory harnesses I just need to know where to plug and what to plug them into.
it is a request that seems reasonable and safe and was answered in the book 101 projects for your 911 in the oil cooler up grade section. He took pictures and explained exactly how to install the harness and where to attach each wire on the fuse panel.
Thanks for your time and your help. i am sure I will find some one who can sit with me and explain how to read a wiring diagram.

Wil Ferch · 07:59 AM

OK...so your base-project car is a 1974 ?.....as I mentioned in the PM's we exchanged, I'll try to call you to discuss some of this stuff.

WOR?.....maybe mean ROW ( Rest-of-World, ie "not" USA spec?).....I'll see what I can find.

OK...so you are not asking for piece-meal help to rewire the entire car. Good. I was confused based on your opening sentence... " I have posted these pics to start because they are the smallest and seemingly the easiest...". Implied maybe you will go thru the whole wiring mess later, in stages, asking for this kind of help. Seems I misunderstood.

Good deal...and good luck.

carrera30 · carrera30's Garage

Gentleman of this post. Since the first question was from a 1977 owner, I'm guessing, I would like to chime in to ask a question on the left side head lamp, I think that is fuse position #8, & the connection to the top & bottom of that fuse block. I fried my grey-red stripe wire after an engine rebuild and testingg the electrical system, My delima is I have a 1977 911 Carrera 3.0 (ROW) and have a very hard time sometimes, getting the correct information for my many problems. Would any of you have something to offer.