Steve,

Thanks for the response, but after much Googling I found the answer and it is not the electrical (I obviously have more than one problem).

I found a description of my problem that fits exactly:

Emissions air injection pumps can seize up, causing a loud squealing noise possibly followed by smoke. The air pump pulley stops turning, but the drive belt does not and this friction causes the noise and smoke. If the engine is not turned off, the belt will snap, turning on the alternator/battery warning light.

My same question still applies - do I R&R the entire pump or can I repair just the bearing?