My 97 Civic would not start. I had the alternator replaced it worked fine. The next day, I got in it and it would n't start. No lights, no power at all. So then I replaced the battery, worked great. The next day I got it in it and it wouldn't start - no power, no lights, nothing.
I'm thinking something is draining the battery, any ideas what it may be?
Thanks

. Remove and fully charge the battery. Most auto parts stores will do this for free.

. Check for parasitic drain. Maximum drain should be 50mA. Focus on add-ons.