I was about to take it on the weekly little trip around the neighborhood. (needs front end rebuilt, etc. not serious road worthy but a few miles here and there fine)

I was all started and warmed up (edelbrock 4bbl on intake, no choke hooked up), which takes a few minutes even in summer.

I put it into reverse and it died.

Electrically.
Not it was not warmed up and going out of parked stalled it.

Like you have when you lose the ground.

Neg terminal to block ground is good and tested.

No power at any fuses.

I am scratching my head about why the lose when go out of park.

My seat belt safety is looped off, and connections are good.

Last week, the fasten seat belt message light was on, which I do not remember seeing before. But not on the drive after that.

I am thinking my first step then might be I should pull the seats and carpet and see if it is a short in the seat belt wiring.

Any better ideas on where to start if good ground off batt and it happened shifting.

Thank you for any tips.