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How To Read 924 Wiring Diagrams

 
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Smoothie  



Joined: 01 Jan 2003
Posts: 8029
Location: DE (the one near MD, PA, NJ)

PostPosted: Thu Feb 14, 2008 7:47 am    Post subject: How To Read 924 Wiring Diagrams Reply with quote

The horizontal lines at top represent the different 12V+ supplies...
30....12V+ always
15....12V+ at both ignition on and start
x......12V+ at ignition-on, but not at start
31....a ground (ok, this one isn't 12V+)
50....12V+ at start

The next full-width horizontal line (with F20, A16, B20, C19, etc.) in the diagram shown shows the connections to the back of the fuse-relay panel. Each connector has a number of pins, and there are 6 connectors, "A" through "F". "F20" indicates pin 20 of connector F, "A16" is pin 16 of connector A, etc.

The lower-most horizontal line at bottom of the diagram represent ground. The numbers below that line are the current track numbers. Everything above a number in a straight vertical line is on that current track. The Roman numerals are page numbers. Looking at "III --- 10 --- cigarette lighter", "III" tells you to look at the 3rd page, "10" says it's on current track 10, and obviously it's the cig lighter. Where there's a circled number just above the current track number line, that indicates one of the main ground terminals (1-5). Where there's a Roman numeral and regular number inside a rectangle, that's telling you where the circuit continues, so go to that page and current track. [V 5] above-right of the cig lighter says go to page 5, current track 5. -And when you look there, you should see a "[III 13]" which refers back to where you just were.

<click for full size diagram>

(or just look at Haynes pg.260)
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2Fast  



Joined: 09 Dec 2007
Posts: 459
Location: Klamath Falls, OR

PostPosted: Sun Feb 17, 2008 12:45 pm    Post subject: Re: How To Read 924 Wiring Diagrams Reply with quote

Smoothie wrote:
The horizontal lines at top represent the different 12V+ supplies...
30....12V+ always
15....12V+ at both ignition on and start
x......12V+ at ignition-on, but not at start
31....a ground (ok, this one isn't 12V+)
50....12V+ at start

The next full-width horizontal line (with F20, A16, B20, C19, etc.) in the diagram shown shows the connections to the back of the fuse-relay panel. Each connector has a number of pins, and there are 6 connectors, "A" through "F". "F20" indicates pin 20 of connector F, "A16" is pin 16 of connector A, etc.

The lower-most horizontal line at bottom of the diagram represent ground. The numbers below that line are the current track numbers. Everything above a number in a straight vertical line is on that current track. The Roman numerals are page numbers. Looking at "III --- 10 --- cigarette lighter", "III" tells you to look at the 3rd page, "10" says it's on current track 10, and obviously it's the cig lighter. Where there's a circled number just above the current track number line, that indicates one of the main ground terminals (1-5). Where there's a Roman numeral and regular number inside a rectangle, that's telling you where the circuit continues, so go to that page and current track. [V 5] above-right of the cig lighter says go to page 5, current track 5. -And when you look there, you should see a "[III 13]" which refers back to where you just were.

<click for full size diagram>

(or just look at Haynes pg.260)
Posting this was a great idea! I dont understand, how do you count the pins? Left to right, up to down? I get A-F because it is stamped on the relay, but not how to count pins. (this stuff is the reason why i like doing bodywork lol)
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1979 Porsche 924 NA 5spd
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Smoothie  



Joined: 01 Jan 2003
Posts: 8029
Location: DE (the one near MD, PA, NJ)

PostPosted: Mon Feb 18, 2008 1:05 am    Post subject: Reply with quote

There are tiny numbers on both the plugs and sockets. Here're 3 of the sockets -

Most of them on the D socket were blown out by the bright flash, but you can see them more easily on C and E. They start with "1" at top-left of each socket, then 2, 3, 4 run across to the right. Drop down and start from the left again for 5, 6, 7, 8, etc.
You can see pins "D3" and "E15" were overheated at some point and their surfaces were oxidized. They were cleaned-up with a small flat jewelers file. The corresponding female pins in the plugs were cleaned with a jewelers needle file.
D3, when burnt, wasn't actually causing any noticable problems, but the burnt E15 caused the windshield wipers to not work - I used-to have to constantly reach under there and wiggle the wires just right to get the wipers working..
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Smoothie  



Joined: 01 Jan 2003
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Location: DE (the one near MD, PA, NJ)

PostPosted: Sat Mar 22, 2008 2:23 am    Post subject: Reply with quote

Wiring color codes are shown in one or more of the diagrams, but they are -
bk - black
bl - blue
br - brown
gn - green
gr - grey
re - red
vi - violet
wt - white
ye - yellow

Numbers shown near the wire color codes are metric wire gauge.

Symbols used should appear on a page immediately preceeding the wiring diagrams.
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v8carreragts  



Joined: 05 Sep 2003
Posts: 651
Location: Tucson, AZ

PostPosted: Fri Mar 28, 2008 1:13 pm    Post subject: Reply with quote

One thing you can always do to promote conductivity between the terminals, acyually anywhere in the car) is something calles "Kopr-shield" and sold by Easwood. It is a copper filled anticorrosion coating for terminals. I've been using this for years and originally tried it with the continual electrical problems I had with my old 79 924. Now I use it on every terminal connection. I has fixed many gremlins in that car. You can get it here:

http://www.eastwoodco.com/jump.jsp?itemID=1369&itemType=PRODUCT
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Smoothie  



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Location: DE (the one near MD, PA, NJ)

PostPosted: Fri Apr 04, 2008 10:48 am    Post subject: Reply with quote

Good stuff, but a little detail on its' use -
Because it's conductive, use only on larger connections, ground points, and single wire connectors. For multi-pin connectors and other situations where connections are close together, but need to be electrically insulated from each-other, as well as spark plug wires, use the non-conductive stuff, "silicone dielectric grease/compound" instead.
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'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox
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v8carreragts  



Joined: 05 Sep 2003
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Location: Tucson, AZ

PostPosted: Thu Apr 10, 2008 1:29 am    Post subject: Reply with quote

I use it on everything. Haven't had any problems with crosstalk. I had some strange problems with the rear connections on the fuse box and this eliminated them.
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Smoothie  



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PostPosted: Mon Dec 14, 2009 4:07 am    Post subject: Reply with quote

Fuses -

1976-'78 diagrams have them prefixed with an "S" (S1-S18).
S1-S15 are within the fuse section of the fuse-relay panel, and appear within the upper 1.5-2" of the diagrams.
S16-S18 are either relay-mounted or in in-line fuse holders. The diagrams show in-line fuse holders in the lower section (below about 1.5-2" of the top), and with some wire seperating them from the next component/connection at either end. Fuses shown directly connected to a relay (no wire seperating them) are relay-mounted fuses. Any of these below the upper 1.5-2" of the diagram can be anywhere in the car. Any within the upper 1.5-2" of the diagrams are plugged into the relay section of the fuse-relay panel.
(The '77.5-'78 diagrams have an apparent misprint with two different fuses labelled as "S18". No problem - just know that one of them is relay-mounted on the radiator cooling fan relay, while the other S18 is in an in-line fuse holder attached to the wiring bundle that's attached to the headlight switch.)

For '79-up they're labelled "fuse 1", "fuse 2 ", etc. These later cars, in addition to the main 15-fuse panel, got an auxiliary 9-fuse panel that'll be found mounted just above the main fuse-relay panel. These cars have fewer (or none) relay-mounted or in-line fuses. Fuses on the aux fuse panel are labelled "fuse 1, additional fuse board" through "fuse 9, additional fuse board", and appear within the lower section of the diagrams. Again, fuses and relays appearing within the upper 1.5-2" of the diagrams are on the main fuse-relay panel, and those shown in the lower section are anywhere else in the car, or if labelled "additional fuse board", are located on the 9-fuse aux panel.
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- shamwow guy

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox
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Scorpio  



Joined: 05 Jul 2007
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Location: Brisbane, Australia

PostPosted: Mon Dec 14, 2009 10:08 am    Post subject: Reply with quote

STICKY PLEASE ADMIN
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!tom  



Joined: 28 Aug 2006
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PostPosted: Wed Dec 01, 2010 3:29 pm    Post subject: Reply with quote

Table of relay function and location
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DZGunner  



Joined: 18 Nov 2014
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PostPosted: Fri Jan 16, 2015 8:02 pm    Post subject: Reply with quote

Your table says its 404'd could someone post the table again?
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!tom  



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PostPosted: Sat Jan 17, 2015 12:01 pm    Post subject: Reply with quote

Darn. That was AppleBit's table.
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brian19600  



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PostPosted: Wed Mar 11, 2015 11:45 am    Post subject: Reply with quote

It was archived here:
https://web.archive.org/web/20090321193134/http://jenniferandjon.com/ABRacing/index.php?option=com_content&task=view&id=16&Itemid=51
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