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Registered
Join Date: Jul 2008
Location: Oakland, CA
Posts: 10
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Stop Lamps on 911 SC
Hey guys, bought my 1981 911 SC about 2 months ago and I'm loving it! The other day a truck rolled up next to me and pointed out that I didn't have any brake lights!
All other systems seem fine - when lights are on, rear lights up, reverse if fine, so I don't think it's the bulb. Could be stoplamp switch or blown fuse yes? Is there anything else i could be? And maybe most embarrassing - which fuse is for the stoplamps? And what does a blown one look like? Thanks for help/suggestions 
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09-28-2008, 07:56 AM
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Join Date: Jun 2002
Location: New Hampshire
Posts: 724
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The bulbs for the rear/brake lights are dual filament. Either the filament for the brake light is burnt or someome replaced the bulbs with a single filament bulb.
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Ice Green '77 Targa 3.6 w/ Steve Wong chip One Way To Get More Horsepower Is To Get A Bigger Horse! "I couldn't find the sports car of my dreams, so I built it myself" Ferdinand Porsche |
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09-28-2008, 08:06 AM
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Moderator
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A common issue w/ SC/Carrera brake lights is the stop light switch. W/ time it becomes less responsive to line pressure so that the brake lights are triggered at higher and higher pressures,
2 cures new swiches add a mechanical switch, some use the cruise control switch
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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09-28-2008, 08:10 AM
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Join Date: Sep 2003
Location: CT
Posts: 828
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Same thing happened to me. I had to replace the dual fitment bulbs. Try that first.
Quote:
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2007 997 TT 1992 500e |
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09-28-2008, 08:11 AM
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Someone told me the same thing about my Carrrera. Tested in the garage and the brake lights work fine. At a stop light I was just not applying enough pressure to the brake pedal. Apparently there is a minimum required pressure to engage the light- it is not an electric switch.
erik
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87 911 coupe "Katy" Summer Yellow Linen Mahogany interior 04 Pilot "The Pilot" |
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09-28-2008, 08:58 AM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Quote:
Someone have the odds on both brake light filiments burning out simultaneously? IMHO, it's pretty high. Read Bill V's post. That's probably the source of the malfunction. Sherwood |
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09-28-2008, 11:31 AM
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Member 911 Anonymous
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Most likely it is the arcing within the Brake Light Switch that melted the internals which caused a non-contact of the terminals activating the Brakes Lights.
I have a solution for you, PM me
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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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09-28-2008, 01:03 PM
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1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
Marble Grey
