Miata shuts off when I turn on the lights.

1997 Mazda Miata
Hey I recently acquired a 1992 miata. I have replaced the Alternator, and replaced the battery. It has sat for about 3 years with very little driving in between those 3 years. It just DIES as soon as you turn the headlights on, what could the culprit be? I just need some leads here. Money is not a problem here.
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2019 Mazda MX-5 Miata Sport
Were you able to resolve this?

My first guess would be something is shorting to ground and it's most likely the wiring harness. Animals tend to chew through them when they've been sitting for a long time. Try removing the headlight relay and fuse, one at a time and then see if the same thing happens.