Prisma Generator Failure

That sounds familiar! I had the same symptoms in my Prisma: weak lights and engine hesitation. Have you checked for any voltage drop when the engine is running? It could give you a clearer picture of what's going on. In my case, it was a classic alternator issue, and it manifested in funky ways.

Voltage drop? I haven't checked that. Where did you measure the voltage, and what reading confirms a generator problem? I'm trying to avoid just replacing parts, because the starter motor seems fine.

Think of your car's electrical system like a circulatory system. The battery is like the heart, and the alternator keeps the blood pumping. When the 'heart' isn't getting enough 'blood', things go haywire. I measured the voltage at the generator terminals with the engine running. You're looking for a reading lower than 13.5-14.5 volts. If it's dropping way below that, especially under load, then you've likely found your problem. I'd recommend getting it checked out by a trusted workshop. Engine misfire may occur.

Thanks! That voltage test advice was helpful. I took it to my local workshop, and you were right – it was the generator. 960€ later, everything is running smoothly again. I appreciate you sharing your experience; it saved me guesswork!