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Lucky Luca
Join Date: Aug 2010
Location: Rome, Italy
Posts: 45
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Rear light off - stop light on
Hello my Porsche friends,
I have a simple question for you. On my 1974 911 2700 "G" the rear lights are a bit naughty. When the engine is running, and I push the brake pedal the brake lights are on (as it should be). When engine is running if I turn on the headlamps, the rear right light is off and the left one is one; if I push the brake pedal both the lights are on. There's just one bulb for light/brake. Suggestions? Cheers from Italy. Luca
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______________________________________ Porsche 911 2700 1974 Gelbgrun Honda CB 400 F SuperSport 1976 Candy red Yamaha FZ750 1985 Grey/Red |
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01-08-2016, 08:36 AM
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Member 911 Anonymous
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Ciao Luca!
First check the fuse panel to insure the wires are seated properly in their designated slots. Second is to remove the rear light assembly and take a look under the rear cover plate. A wire or two may be loose and shorting out your system. Carefully inspect the plastic type board behind the sockets. They are liken to a computer's PCB board and are very brittle. 
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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01-08-2016, 08:52 AM
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Registered
Join Date: Apr 2005
Location: outta here
Posts: 53,737
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Check the bulb. It sounds bad, as in one filament has burned out.
JR |
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01-08-2016, 09:48 AM
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Registered
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Careful with those tabs holding the PCBs in, they break easy.
I use a trouble light with the bulb removed to first determine whether both contacts are getting 12V.
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Jason - Austin, TX 82 911 SC targa (gone, but not forgotten) 92 968 coupe |
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01-08-2016, 12:03 PM
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Lucky Luca
Join Date: Aug 2010
Location: Rome, Italy
Posts: 45
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Hello my friends,
just to close the topic...I have checked the bulb before writing the post, but it's worth to remind. Later I noticed that also the front light was off. Then I surfed the web searching for the electrical diagram - I found it together with the user manual. I realized that there is a separate circuit (and consequently a separate fuse) for the parking light left and right and not for front and rear. Then I replaced the fuse and everything is working now. The torpedo fuse actually was ok but that type of fuses tend to oxidize - for such cheap money better to change all of them avery 2-3 years. Thanks a lot for your help, Luca
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______________________________________ Porsche 911 2700 1974 Gelbgrun Honda CB 400 F SuperSport 1976 Candy red Yamaha FZ750 1985 Grey/Red |
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01-12-2016, 07:08 AM
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Registered
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Even better is the 911-FPR fuse panel replacement! But not as cheap as changing fuses all the time
 Glad you found the problem. I find it's always best to check fuses first, then relays, before testing anything else.
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Jason - Austin, TX 82 911 SC targa (gone, but not forgotten) 92 968 coupe |
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01-12-2016, 08:09 AM
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Marble Grey
911
