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Registered
Join Date: Jan 2006
Location: Santa Barbara, CA
Posts: 2,307
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Tough 73.5/74 Wiring Question. I'm stumped.
Car and most cabling is a 1973.5...the first CIS Porsche I think. The motor is a 74, and I'm using the 73.5 rear electrical console/panel with its associated 14 pin connectors.
I have spent several days meticulously tracking the wiring to be sure that everything is compatible. Everything checks out nicely except the wiring that supports the warm up regulator. There is a small supplemental drawing in the 73.5 workshop manual showing how the wiring was changed to support the WUR and its associated relay. The supplemental diagram shows that the control side of the relay is wired into the voltage regulator. This ensures that no current can flow to the WUR relay, and hence to the WUR itself if needed, unless the motor is running. So relay pins 86 and 85 are supposed to go to voltage regulator D+ and D- respectively. Seems straight-forward. But here's how my console is wired: relay pin 86 is connected to the yellow wire using pin 1 of both the front and rear 14 pin connectors...the wire carrying juice to the starter from the ignition switch! This looks stock, but doesn't agree with any schematic I have. Nor does it seem to me to make sense, as I understand a yellow wire to be one which carries current only when the start switch is on. Can anyone explain what I have here? Thanks,
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jhtaylor santa barbara 74 911 coupe. 2.7 motor by Schneider Auto Santa Barbara. Case blueprinted, shuffle-pinned, boat-tailed by Competition Engineering. Elgin mod-S cams. J&E 9.5's. PMO's. 73 Targa (gone but not forgotten) Last edited by moneymanager; 11-23-2007 at 06:29 AM.. Reason: correct error |
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11-21-2007, 01:38 PM
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AutoBahned
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I recall some weirdness on the yellow wire (fat one?) on my '73.5 when I was putting in a 3.2L motor -- but I can't answer your question.
Anyway, there's your bump... |
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11-21-2007, 02:44 PM
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Registered
Join Date: Jan 2006
Location: Santa Barbara, CA
Posts: 2,307
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bump
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jhtaylor santa barbara 74 911 coupe. 2.7 motor by Schneider Auto Santa Barbara. Case blueprinted, shuffle-pinned, boat-tailed by Competition Engineering. Elgin mod-S cams. J&E 9.5's. PMO's. 73 Targa (gone but not forgotten) |
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12-10-2007, 01:00 PM
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Registered
Join Date: May 2004
Location: Lake Cle Elum - Eastern WA.
Posts: 8,417
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I'm certainly no expert, but as I recall, the 73.5 is unique in that the "Cold Start Valve" is only activated when the "lever is pulled up" AND the starter is cranking.....Once you let the key return to "run", it's no longer supplying extra fuel.........Like I said, I may be wrong, but that's my understanding.....
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Bob S. 73.5 911T 1969 911T Coo' pay (one owner) 1960 Mercedes 190SL 1962 XKE Roadster (sold) - 13 motorcycles |
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12-10-2007, 01:21 PM
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