Hello ForgerofMetal Use a hose in your ear as a stethoscope to track down a noisy pulley in the engine compartment. I going to guess is the alternator pulley, which “ free wheels “ on these cars; it isn’t just a solid pulley, it has a clutch. You might be able to hear the change while WoodWorker rev...

I got that symptom backwards to your report. As Roseann Roseannadanna would say...

never mind!

Replace that brake switch, then try the stethoscope trick. Don’t leave that brake switch too long, it might be running your vacuum pump constantly which will wear it out, and it’s not cheap