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Petrolhead
 
Porschepetter's Avatar
 
Join Date: Jun 2025
Location: Fredrikstad, Norway
Posts: 16
Garage
Brake lights and sunroof stopped working after replacing turn signal switch – ’76 911

A few days ago I replaced the turn signal switch on my ’76 911S.
After the replacement, the low beam, high beam, and all functions related to the switch worked fine.

However, I noticed that both the brake lights and the sunroof stopped working right after I installed the new switch.

Could these issues be related to the turn signal switch replacement, and if so, what should I check first?

Thanks in advance for any suggestions!

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1976 Porsche 911 S, Coupe
1978 Porsche 911 SC, Targa
1983 Porsche 911 SC, Coupe
1983 Porsche 944 Coupe
Old 08-05-2025, 03:43 AM
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PCA Member since 1988
 
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,225
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Check fuses first. Otherwise, it's likely that you pulled or bumped something that loosened the connections to those circuits.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.

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Old 08-05-2025, 09:48 AM
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Petrolhead
 
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Join Date: Jun 2025
Location: Fredrikstad, Norway
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Quote:
Originally Posted by PeteKz View Post
Check fuses first. Otherwise, it's likely that you pulled or bumped something that loosened the connections to those circuits.
Thanks, PeteKz. Yesterday I replaced all of my fuses, and the sunroof started working So now it΄s just the brake lights that must be fixed. Not sure how long they have been out of work, so I start by checking the brake pedal switch and see where the power ends.

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1976 Porsche 911 S, Coupe
1978 Porsche 911 SC, Targa
1983 Porsche 911 SC, Coupe
1983 Porsche 944 Coupe
Old 08-06-2025, 01:44 AM
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