Engine fired up first time...but electrical help needed

1 - The reg was changed prior to my previous post...I had wired it incorrectly so thats part of the reason the Alt went onto overcharge.

2 -After fixing the wiring and changing the reg, I attached an earth wire to the regulator mounting screw to mmake sure it was grounded properly

3 - I performed the suggested check to the alt field posts to ma,ke sure they were not grounding.....the resistance showed infinity so no issue there.

I SUSPECT a dodgy battery terminal connection, or a bad battery earth. ( My battery is in the trunk connected by HD welding wire to the start relay post.

Trouble is, we now have collateral damage to fix....so under dash will require inspection before any further testing can be done.

Thanks for the tips everyone on testing.......Ill be sure to let you know what we find.