95 honda accord charging system problems

I have a 95 Honda accord. i have a new alternator and new battery but my car won't stay on. All my fuses are working and are fine yet my car won't keep its charge. How do I fix it.

I have a 95 Honda accord. i have a new alternator and new battery but my car won't stay on. All my fuses are working and are fine yet my car won't keep its charge. How do I fix it.

Is it dying overnight, when driving?
Have you put a voltmeter on the battery with car running?
Need more details.

I had my battery tested and the alternator and they told me that they both are good.it dyies while driving. I checked battery charge this morning and the charge still good. But once I cranknmy car it will stay on for a little bit and then everything in the car starts dying. Then my car will start dying and just finally stop. Then Ihave to get my battery charged back up before anything on the car to turn on again.