Troubleshooting fuseable link failure

I've been working on 68 barracuda for a while now started it up moved around many many times but never took it down the road . I discovered the alternator i just bought wasn't charging, well it had 2 field posts so I ground one everything seemed to be fine so I took the car out for a mile and half drive . I get back shut the car off,later parked in the garage, and this morning now power, the fuseable link burned . So I would like to know why and where to start or any other input would be appreciated. Did that field wire I grounded affect anything? I've seen posts about bypassi g the ammeter my is working fine and really didn't see what is done with the field wire