leonkeller41
Renault Spider Overvoltage Fault Codes
Summary of the thread
The 1999 Renault Spider is experiencing electrical issues, with consistent 'overvoltage' fault codes and a weak battery. These problems could be caused by a defective battery or a failing voltage regulator within the alternator. It is suggested to check the alternator output, which should be around 14.4V when the engine is running, to confirm if the voltage regulator is the issue. A professional diagnosis is recommended to accurately identify and resolve the problem.
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4 comment(s)
leonkeller41 (community.author)
Thanks for the quick reply! I haven't checked the alternator output directly, focusing on the battery itself. Is there a specific voltage I should be looking for when testing the alternator? And where is the voltage regulator located? Is it integrated into the alternator itself?
MarionXpert
Yes, the voltage regulator is usually integrated into the alternator. You should see around 14.4V when the engine is running. If it's significantly higher, then the regulator is likely the culprit. Given the complexity, I would suggest a workshop diagnoses this with professional equipment.
leonkeller41 (community.author)
Okay, I understand. I'll take your advice and get the alternator checked professionally. The diagnosis was indeed a defective battery and voltage regulator. The repair including parts and labor ended up costing 290€. Thanks for pointing me in the right direction!
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RENAULT
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SPIDER
MarionXpert
I had a similar problem with my Renault Spider. Lots of strange electrical faults cropping up. Have you checked the alternator output? It might be the voltage regulator failing and causing the overvoltage. That would explain the fault codes and the weak battery.