Alternator overcharging

That VR is smoked! sub in a replacement, before it sets your car on fire.

No, the pulley size is not the source of this issue

The VR is either not finding the battery, or it's hung up WOT, or, I suppose there could be a dead short from battery to ground thru a device or connection somewhere, sending the VR into overdrive, but then the smoke would be the telltale,not lol.

So shut the engine off and look for an off-draw; if none found, replace the VR