TRM

Continuing to try and find out why my instrument lights are dead. Got a hold of a nice copy of of one of the wiring diagrams from a fellow Rennlister.

Can anyone tell me the following:
1. What do the numbers such as 0.5 and 0.75 next to the wiring color codes mean?
2. What is designated by the numbers in the small boxes such as N50, 60, J26 or two numbers in boxes like 31|138?
3. Also other number designations such as 2.5RE or M480 alongside a circuit wire?

Anything else that would be good for me to know about Porsche wiring?

MDamen

I'm familiar with BMW diagrams. A lot of the nomenclature is the same.
1. 0.5 and 0.75 are the gage sizes of the wires.
2. The small boxes are generally either a junction or splice or a continuation to another diagram.
3. 2.5 RE - 2.5 is the wire size and RE is the color. This should be a big red wire. I'm not sure what the M480 means. It could be a wire bundle identifier.

e9stibi

Sometimes wiring differs by model/option codes. M480 means here that it only applies if you have the M480 option. (in this case 6 speed manual transmission if "kindel" is correct)

To 1. Because the car is European, the gage size will be mm2. This should not be relevant for troubleshooting and if in doubt, go bigger.

I am not sure if you got the complete "copy" of the diagrams but it has legends that explain everything that you are asking for.

rsr91128

I emailed you a couple of pages out of the tech manual that should explain the markings, they didn't come with my set of diagrams.

Hope it helps

EDIT... Oops, wrong pages printed. I'll resend the right pages tomorrow.

Rich Sandor

Erik, could you please email me those as well? I'm just in the middle of reading wiring diagrams and I could use the help!

Thanks,
Rich
rsandor at shaw dot ca

Rich Sandor

I also just found this excellent wiring diagram primer

http://www.928-electrics.com/Porsche/928_electrics.htm

Coleman

Nice find! I have some reading to do!

axl911

I scanned through the doc, but it still doesn't tell me what the square box with the number means. For example the "60" box shown in the pic.

I know it's a 3 way junction. But what the hell the "60" denotes?

rsr91128

Here is my understanding of the wiring diagrams from my reading.

#1. As noted the small number and letter next to the wire is gauge and color, the color legend is located at the bottom of each full page of the diagrams.

#2. If you look at the picture in the first post the question is what does the "N55" box mean. That is a continuation of the wiring at another location in the diagram. N55 means the grid on the sides and top/bottom of the schematic. So to find N55 you will follow the grids down to N on the top and 55 on the side. This will take you to sheet 6 instruments. Then go to that grid and you will find the continuation of that wire. The other number (60) designates a connection. The connections are kind of explained in detail in the opening pages of the diagrams. Below is a picture of the location of N55, I circled the other end of the wire and you can follow that white/green wire to light #6 in the clock. You can see that on this page it is marked as J2, that was the location from page 1 in the above picture.

It is much easier to read these if you have them printed out and can follow them visually.

rsr91128

Rich,

I don't mind to send you those, but the construction page and instructions are really geared for the 993 diagrams and might not make much sense for the 928 diagrams. I didn't look through the pages at the link you posted yet, but it looks like that will answer your questions.

Let me know if you need the 993 pages.

Rich Sandor

Thanks Erik.

To be honest in the last 2 days I think I've figured it out. The 928 manual primer really helps, and 99% of it was relevant to my 944. (same era)

The 993 diagrams are actually much improved and easier to read than the mid-80's ones.

Now I just have to sketch out how on earth my race car is going to run with just the bare minimum wiring!

gubsta

Apologies for the epic thread resurrection.

Could somebody tell me what the number in the square box denotes. So for example the 105 and 106 in the extract above?

Is this just a junction box or spliced connection?

Cheers

BobbyT

Motor magazine 2003 had this excellent article that covers European electrical circuits very well:

http://www.e38.org/understanding%20e...20diagrams.pdf

pp000830

M480 means that wiring section noted applies to car with "M480" option, in this case 6 speed manual transmission.

Cupcar

I have found them to be wire splices within the wiring loom itself, usually soldered and covered with a blue vinyl cap and under the tape wrapping the harness. I am lost on what the number inside the box means, perhaps an internal design tracking number???