Confusing realy/fuse charts
#32
Thanks for the great work, Alan. These comments are about the '77-'79 chart. Great work deserves thoughtful questions, so here goes. I hope my ignorance makes my questions more basic and useful rather than less.
FUSES
I'm not sure I understand the coding on the "Input Bus" line. I think that:
#14-23 are fed straight from the Battery and so are always powered;
#5-8 are fed by the Accessory and so are live when the key is in or past the "Accessory" position;
#9-13 are fed by the Ignition and so are live only when the key is in the "Start" position or the car is actually running.
But that leaves me confused about #1-4 and #24-34 and the light greenish color on the rest of the "Input Bus" line, unless all of those are on when the key is in "Run," past "Accessory" but before "Start." Maybe I don't understand the idea of "Bus," is there a "Run" bus?
FUSES
I'm not sure I understand the coding on the "Input Bus" line. I think that:
#14-23 are fed straight from the Battery and so are always powered;
#5-8 are fed by the Accessory and so are live when the key is in or past the "Accessory" position;
#9-13 are fed by the Ignition and so are live only when the key is in the "Start" position or the car is actually running.
But that leaves me confused about #1-4 and #24-34 and the light greenish color on the rest of the "Input Bus" line, unless all of those are on when the key is in "Run," past "Accessory" but before "Start." Maybe I don't understand the idea of "Bus," is there a "Run" bus?
I think I understand the numbering of the "Relay Socket Terminal ID's" but I'm confused by the "Plug Terminal" diagrams. That might go away once I retrieve the spare fuse & relay panel I have, somewhere, and puzzle over it. Is it that the slots in the Plug Terminal pictures show which relay prongs are paired (complete a circuit, right?) when the relay activates?
For the relay sockets (terminals 1-9)- the panel also has embossed labels - however these are very very tiny indeed - most people who even look for them don't see them. It is helpful to establish the pin numbering to a standard (and Porsche already did this but didn't really publish it) - there then needs to be a mapping to common SPST/SPDT relay usage elsewhere (this part is not year specific so doesn't really belong here - will be done, I have a version of it already). Note that not all relay sockets have all these terminal slots (some do, some slots are unpopulated with terminals) and certainly not all relays have all these pins either. Some Porsche special function relays use these exact pin labels while others use functional lables or a mixture of both. Generic Bosch style SPST & SPDT always use functional labels |(30)| - As above (30) always has a specific meaning - it is the direct battery connection to the panel (in this case direct from the jump post) - 3 large blade type terminals.
The questions were good - I'm sure others are confused also. Unfortunately to get to one single sheet per year certain assumptions & simplifications must be made - since these will all be consistent they can be explained in a single overview with this type of content - I had anticipated it would be needed but have not done it yet ... lets see what else is not clear to figure out what is needed. They generally follow Porsche conventions so many will 'get' it. More details on these conventions exist in my Wiring Diagram Primer document.
Alan
Last edited by Alan; 02-05-2014 at 10:13 PM.
#33
I have a version of all of them, but I'm reluctant to share when it is likely that systemic issues will need to be corrected for all of these. I'll clear those up first and rebuild all the diagrams.
For example Roger has identified that the original stock relays have superseded versions - this will change all diagram's content. I'd prefer to have very few diagrams that are known to be incorrect circulating around.. I will color code the whole page to indicate diagrams that are final enough for distribution when we get to that point.
Alan
For example Roger has identified that the original stock relays have superseded versions - this will change all diagram's content. I'd prefer to have very few diagrams that are known to be incorrect circulating around.. I will color code the whole page to indicate diagrams that are final enough for distribution when we get to that point.
Alan
Last edited by Alan; 02-05-2014 at 06:17 PM.
#34
Alan,
All are good apart from these additions - couple of numbers are not good.
Roger
141.951.253.B
1H0.953.227
431.951.253.G
928.612.473.00
928.615.111.00
928.615.113.01
928.615.114.00 = 928 615 114 01
928.615.115.00
928.615.116.00
928.615.117.00
928.615.117.02
928.615.119.01
928.615.123.00
928.615.124.01 = 928 614 124 03
928.615.125.00
928.615.125.01
928.615.126.02
928.615.127.00
928.615.137.01
928.615.203.00
928.618.102.00
928.618.105.00
928.618.107.02 = 928 618 107 05
928.618.107.04
928.618.108.00 = 928 618 108 01
928.618.108.01
928.618.109.00
928.618.109.01
928.618.111.00
928.618.113.01 = 928 618 113 02
928.618.115.00
928.618.221.00 = Not a good number
928.618.223.00
928.618.225.01
944.615.119.00
944.615.166.00 = Not a good number
993.615.101.00 = 993 615 101 01
All are good apart from these additions - couple of numbers are not good.
Roger
141.951.253.B
1H0.953.227
431.951.253.G
928.612.473.00
928.615.111.00
928.615.113.01
928.615.114.00 = 928 615 114 01
928.615.115.00
928.615.116.00
928.615.117.00
928.615.117.02
928.615.119.01
928.615.123.00
928.615.124.01 = 928 614 124 03
928.615.125.00
928.615.125.01
928.615.126.02
928.615.127.00
928.615.137.01
928.615.203.00
928.618.102.00
928.618.105.00
928.618.107.02 = 928 618 107 05
928.618.107.04
928.618.108.00 = 928 618 108 01
928.618.108.01
928.618.109.00
928.618.109.01
928.618.111.00
928.618.113.01 = 928 618 113 02
928.618.115.00
928.618.221.00 = Not a good number
928.618.223.00
928.618.225.01
944.615.119.00
944.615.166.00 = Not a good number
993.615.101.00 = 993 615 101 01
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
#35
Roger
Both of these were garbled in my source material - well caught sir!
928.618.221.00 got subsituted somehow from 964.618.221.00 (speedo converter)
944.615.166.00 I believe it was a transcription error 944.615.116.00 seems to be correct - 944 window regulator.
Alan
Both of these were garbled in my source material - well caught sir!
928.618.221.00 got subsituted somehow from 964.618.221.00 (speedo converter)
944.615.166.00 I believe it was a transcription error 944.615.116.00 seems to be correct - 944 window regulator.
Alan
#36
Roger
I don't think these are equivalent functions: 928.618.107.02 = 928 618 107 05
Early (pre-S4) headlight relay and S4+ headlight relay
They use different motors (uni-directional vs reversing) and have different limit switch configurations...?
Alan
I don't think these are equivalent functions: 928.618.107.02 = 928 618 107 05
Early (pre-S4) headlight relay and S4+ headlight relay
They use different motors (uni-directional vs reversing) and have different limit switch configurations...?
Alan
#37
And maybe indicate original p/n and current replacement (perhaps in italic).
Great work of benefit to the community - thank you.
#39
964 618 221 00 is a good number with no SS
944 615 116 00 is a good number with no SS
Early 80 to 86 light double relay = 928 618 107 00 & 928 618 107 02 and both SS to 928 618 107 05
Later 87 to 95 light double relay = 928 618 107 04 current number with no SS
UK (dim/dip) double relay 928 618 107 01 only used 87 to 90. Later cars used 928 618 107 04
944 615 116 00 is a good number with no SS
Early 80 to 86 light double relay = 928 618 107 00 & 928 618 107 02 and both SS to 928 618 107 05
Later 87 to 95 light double relay = 928 618 107 04 current number with no SS
UK (dim/dip) double relay 928 618 107 01 only used 87 to 90. Later cars used 928 618 107 04
#40
Do you know on what years 107.00 & 107.02 were installed as stock?
I assume 107.00 came first from 1980-19?? and 107.02 was from 19??-1986
Thanks for all the help
Alan
#41
I assume 107.00 came first from 1980-19?? and 107.02 was from 19??-1986
I don't have sufficient info to make a chart for all years of early ROW cars, but can do it for S4 & later which varied only slightly. Will add this to the project list (at the end!).
#42
Roger (all?)
Are these still active numbers for intermittent wiper relay?
928.625.101.00
928.625.101.01 Assume this superseded .00
I know 993.615.101.01 is an alternate here does it also now supersede both of these..?
Alan
Are these still active numbers for intermittent wiper relay?
928.625.101.00
928.625.101.01 Assume this superseded .00
I know 993.615.101.01 is an alternate here does it also now supersede both of these..?
Alan