I have 1989 Honda Civic Wagon.
Two weeks ago in the morning suddenly I cannot start my car because battery was fully empty (voltage = 0).
I have recharge the battery and car start wary good.
Next morning history became again.
Help me, please.
P.S. I have new battery and yesterday have checked it in the store.
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If Battery is good, then you have a Drain, or Alternator is not providing a charge.
When Battery is charged, measure voltage(engine off), start car, measure voltage, if no increase, it is likely not charging.
Measuring the Current on battery cable will tell if it is a drain.

Thank you.
All that I have done.
When I switch on the engine, battery voltage rises
And the car rides smoothly.
If you turn the engine off and not
Turn of the battery, by the morning on the battery voltage is zero.
We need to recharge it again (Jump).

Then you have a drain on the system. An Ampmeter works best, without one, you can disconnect a Battery Cable, hook a 12 volt light to battery cable, and one lead to battery post.
Then with door closed(dome light out), pull fuse one by one until light goes out, start replacing until light goes on, at the end you want the light out and the circuit(fuse) identified.
Diodes in the alternator can fail, so if fuses aren't it, disconnect Alternator, Regulator? Have found a defective Seat Belt Interlock cause a drain on one car.

I think diodes in the alternator - bad.