Blows Main Fuse at 1/4 Throttle???

cudamark said

My suspects.........
1. Your hacked up wiring is not connected correctly or wrong gauge.
2. Bad regulator
3. Mismatch between reg and alt
4. Alt. is higher output than wiring can handle (were those fusible links really only 30 amp??) Seems to me that if the alt is putting out full amperage to charge the battery, the whole current flows through the ammeter and the fusible link to get to the battery. 60-70 amp output....30 amp fuse....sounds like the fuse is doing it's job!
Thanks, Mark

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It is weird because the car ran fine for months before I put in the new motor.
The wiring has been the same and it was running fine until yesterday. If it is a direct short it can not be anything that I touched. I actually do pretty good work if you can believe that.......haaaaaa I will check all the other connections in the next few days. I will find the problem and post the outcome in a few days....

Oh yeah I bought the alternator and regulator from NAPA on the same day! I have ran the car and all fine before this issue.

Thanks for your help!