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Registered
Join Date: Sep 2005
Posts: 335
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WUR Voltage at connector 74 911S
Starting the car. I took a voltage reading at the WUR connector. It read 3.6 volts. What should this voltage be?
1974 CIS Porsche 911S Thanks |
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10-08-2005, 04:46 PM
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Join Date: Sep 2005
Posts: 335
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Should it be 12.6 volts? Could the relay be bad?
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10-09-2005, 05:44 AM
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Registered
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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Should be around 12 volts; it could be bad internal relay contacts but more likely is a bad connection somewhere "upstream" of the WUR. Bad connection (from corrosion and mechanical wear) results in high resistance which causes a voltage drop. Places to check: 14-pin connector on left side (driver's side) of engine compartment; circuit you're trying to correct has a red and white wire. One can tighten the 14-pin connector male contact pins by spreading the crossed slits with a razor blade and cleaning the outside of the pins with with a No. 2 pencil eraser; use nothing more abrasive than the eraser as they are silver plated. Next place to check is the relay socket on the rear electrical console or chassis (on the shelf on driver's side of engine compartment). Remove the relay; spread the pins if slotted and seat and unseat the relay several times, apply dielectric grease (a silicone grease not silicone rubber) to the pins and reseat. Check fuse 23 on the rear electrical console; red and white wire and yellow wire goes to one side of fuse. Check small screw clamping wires at yellow wire end of fuse bracket. Back off small screw and clean wires and contacts with emery cloth and apply dielectric grease to contact surfaces; retighten screw and secure with a small drop of blue or green loctite thread locking compound. Note I doubt the fuse is the problem but the screw secured joint with the yellow wire could be. I believe 12-volt power comes through the yellow wire and not through the fuse. Cheers, Jim
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10-09-2005, 08:32 AM
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