Renault Spider Overvoltage Fault Codes

I'm experiencing electrical issues with my 1999 Renault Spider (gasoline engine). The car has 50543 km on the clock. I'm getting consistent 'overvoltage' fault codes across multiple systems, manifesting as seemingly random system failures and a weak battery when I try to start the car. I've checked all the fuses and connections I can easily access, but the problem persists. Could a heavily discharged or defective battery really cause such widespread issues?

4 comment(s)

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.

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?

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.

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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