I bought a 140amp alt and it was great....when I have driving.... When I was at idle, it wouldn't charge like it should. I used the stock pully and the underdrive pully and nieither one fixed my problem. So, I called March and bought the overdrive pully. It worked great (for the first two weeks). One day on my way to school, my regulator blew and fried my headlights (Ford had internally regulated alts). So, I went back to the stock alt. I still have poor charging at ldle but as long as my car runs, I am not that concerned about it. I am going to put the overdrive pully on the stock alt and see if that helps.
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