55.2-59 Battery draining

[Phungki]

So my battery completely drains overnight. I only have the ignition, starter, distributor and alternator hooked up. Just what is necessary to turn the key and start it. Its a new painless wiring system. The key is taken out so its not accidentally left on acc. Im new to this vehicle restoration stuff. Some days its a lot of fun and some days I think I’m spending money just to be frustrated.
I don’t understand why a battery drains overnight with so little hooked up.
Im using a new optima redtop if that matters