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Join Date: Jun 2020
Location: Switzerland
Posts: 50
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1975 Carrera - Red Alternator Light On
I have been enjoying my 75 911 Carrera (US Spec) and the car runs strong but the red alternator light goes on and never off.
I have checked the Porsche Owner's Manual and it mentions the the V-Belt might be a reason but I have exchanged it when I got the car and it seems to be fine. The other potential issues it mentions are the regulator or the alternator. Anybody can share their experiences with this ? Many thanks in advance. |
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06-28-2020, 07:59 AM
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If the alternator is turning, then you have either a bad voltage regulator, a bad alternator, or some wiring has come loose.
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06-28-2020, 08:04 AM
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I'd put a volt meter on the battery and measure voltage. Then start the car and measure voltage at around 2500 RPM. If you aren't getting around +14 volts at 2500 RPM, then your alternator may need some help.
Here's a 914 troubleshooting article, but it works for the 911 also: https://www.pelicanparts.com/techarticles/914_alternator_troubleshoot/914_alternator_troubleshoot.htm
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Rex 1975 911s and 2012 Range Rover Sport HSE 1995 BMW R1100RS, 1948 Harley FL |
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06-28-2020, 08:24 AM
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Thanks to both.
Another question, here is a pic of the gauge and in red marking the light that goes on and never off. I was told that it could be a brake light sensor, my car is a 75 and was built in Feb75. What do you think and why it is labelled "B" under the light ? Thanks again. 
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06-28-2020, 11:17 AM
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Location: South Carolina
Posts: 140
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That's the brake warning light. My 73 has a switch, with a reset button, on the master cylinder used to clear that light. It is also an indicator for the hand brake.
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06-28-2020, 12:08 PM
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My other ride is a C-130J
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“G” is Generator/Alternator. On my ‘75 the “B” light is the handbrake and there is a buzzer that goes off when engine is running and handbrake is engaged.
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1975 911 Targa S 3.0 2000 911 Carrera Cab 2005 Cayenne Titanium Metallic 2022 Mercedes-Benz E450 Coupé 2020 Mercedes-Benz E350 2006 ACG Hummer Previously Owned Art from Stuttgart 2000 Boxster -1983 911 SC Cab -1984 944 N/A |
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06-28-2020, 12:21 PM
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Makes sure the handbrake is pressed all the way down. Some times the sensor is very sensitive.
Let us know what you finally figure out. Thanks and good luck Tony |
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06-28-2020, 01:04 PM
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Apparently the issue is the sensor in the Brake Master cylinder. Porsche has the part but are asking me if it is a 2 cable or 1 cable, anybody know? Thanks
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06-29-2020, 01:36 AM
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One terminal lug is single pole two is double.
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06-30-2020, 06:42 AM
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1975 Porsche 911s
Dee
