Technical Electrical issues

Hey all....I drove my car all day two days ago with no issues....cleaned it yesterday. ..wanted to drive it today and when I turn the key nothing happens. Gauges dont move, electric fuel pump doesnt come on....nothing. I am running the original flathead with 6v system.
Thoughts as to where to start?

 

Sounds like you have a loose battery lead or the battery is dead?

 

^^^^^Or something drew the battery down ie you left something on or a possible failed component. You need to start checking at the battery with a meter and go from there.