Resolved.
It was main ground from the battery to frame. Bolting to frame was rusted and a bit loose. Grinder the surface reattached with new bolt and nut. Then it fired right up.
Thanks all for the replies and time.
Hello,
I’m no mech, so please bare with me. My smog pump froze on me, so I replaced the belt to run the alternator solo.
After a jump, it idled for a good 20 minutes then I shut it down.
Picked up a new battery from Napa and it fired right up.
The next morning I go to start it, click or pop...