SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Car suddenly dies. Still has power but loses some electrical functions.

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Old Feb 5, 2025 | 09:40 PM
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Car suddenly dies. Still has power but loses some electrical functions.

I was sitting in my car while it was parked and running. Suddenly engine shuts off. Cranks but doesn’t start anymore. Radio and windows stopped working, but other electric functions like lights all working. About 5-10 minutes later my drivers window rolls down all the way and I was able to start my car again and everything functioned as normal. This has happened twice so far. Battery was recently changed.
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Old Feb 6, 2025 | 02:32 PM
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UPDATE: Had battery and alternator tested, both functioning properly. Still have no idea what it can be.
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Old Feb 6, 2025 | 05:25 PM
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2000 SL500
Year and model? Might be the cps depending on mileage and when it was last replaced
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Old Feb 6, 2025 | 06:38 PM
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Originally Posted by Amir_AMG
Year and model? Might be the cps depending on mileage and when it was last replaced

2001 SL500. I just replaced the cps a few months ago. Was having a similar problem. Before, engine would shut off but every electric functioned properly. Now, when it shuts off, windows and radio don’t function.
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Old Feb 6, 2025 | 09:59 PM
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Originally Posted by Mf909
2001 SL500. I just replaced the cps a few months ago. Was having a similar problem. Before, engine would shut off but every electric functioned properly. Now, when it shuts off, windows and radio don’t function.
im just learning this car sorry not a big help. Possibly voltage regulator?
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