[Citroënbender]

Yes, it’s not uncommon. A shorted diode, melted solder that’s bridging connections, thick heavy oily carbon residue that conducts, a cocked brush from wearing to nothing.

I’m one for rebuilding them if a name brand to begin with - Bosch, Denso, Mitsubishi, Valeo and Delco are all well supported in aftermarket and genuine parts from the front pulley through to the SRE bearing and back overcap.