I had a underdrive pulley set up on my car and I had low voltage at idle. It didnt fluctuate much. It was still charging but just barley especially when the electric fans would kick in. I put the stock pulleys back on and sloved the problem.
I think you should put the stock pulleys back on and see what happens. I think your problem might be that the alt. might be on its way out and the underdrive pulleys are just making it worse.
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