Why won't your brand new battery stay charged on your 1987 300 zx non turbo?

First check your alternator to see if it charging the new battery. If it is, then you might have bought a bad battery. If the alternator isn't charging then you need a new one.

Check your amp guage if it has one. That is the very first place I would start looking! More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.