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Zuffi-Freund
Join Date: Nov 2008
Location: Germany, Frankfurt Area
Posts: 159
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WUR Cabeling 74CIS
Hi Folks,
I have a problem with the wiring of my 74CIS WUR. Some PO did cut up the harness and cut off the red/white +wire from the WUR and put in a new cable going to the 14pin connector. Ground was refitted by a cable going to the bolt of the WUR. Since I have cold-start problems I also think it could be the WUR. On ignition it has no Power, and the PIN on the 14 PIN Connector has Power. But as soon as I re-connect the Connector, power at the WUR is gone and the relay clicks (there is only one relay). When I disconnect the Blue wire from Alternator Control Light the WUR gets power on ignition. After I tried cold start with disconnected Blue wire, the engine staqrted immediately. So my question: Does WUR get power only when I crank the engine? And where does the WUR normally gets Ground from? Is theis Ground switched? Maybe I got an easy fix - otherwise I got an appointment in a shop to measure everything. Any help?
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******************** best regards Heiko Porsche 911, 74 Lachs-Diamant Metallic |
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11-24-2009, 05:18 AM
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The wur only gets power when the car is running and the alternator is charging. When the alternator starts charging it closes the relay to provide power to the wur.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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11-24-2009, 06:17 AM
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Zuffi-Freund
Join Date: Nov 2008
Location: Germany, Frankfurt Area
Posts: 159
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Thanks for the Info,
so the question is when does the alternator charge - when I crank the engine? It should, because "the parts are moving"  So I`m going to figure out how to test this. Is there an easy way to crank the engine from the engine compartment? So I can see my current tester?
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******************** best regards Heiko Porsche 911, 74 Lachs-Diamant Metallic |
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11-24-2009, 06:44 AM
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see this diagram
Looks like is should go to fuse#3 in the engine compartment. It has 12VDC when alternator is operating so it should be always active if car is started.
 see part number 13.. it goes from Red/whtite at the fuse# 3 in the fusebox (item#80) to the 14 pin connector then changes color to black purple to the wur. The Wur is grounded anywhere it gets a good ground.
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1975 911S Targa Silver Anniversary Edition Last edited by 47silver; 11-24-2009 at 07:22 AM.. |
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11-24-2009, 07:18 AM
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Zuffi-Freund
Join Date: Nov 2008
Location: Germany, Frankfurt Area
Posts: 159
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I see - so I have to test it while the engine is running cold - I was confused 'cause the 3 had power with ignition on and 14pin disconnected. When connecting 14pin power was gone - so it could work as desired or designed :-)
Thanks for helping!
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******************** best regards Heiko Porsche 911, 74 Lachs-Diamant Metallic |
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11-24-2009, 07:29 AM
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just make sure it is wired to fuse3
Just make sure is wired as the diagram shows and the heater in the wur will function as designed.
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1975 911S Targa Silver Anniversary Edition |
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11-24-2009, 07:45 AM
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1974 Porsche 911 targa 2.7
