Sometime it starts sometime it wont start

[Hilohawaiian]

I have a 1990 nissan sentra that i absolutely love driving but for some reason it will start normally and sometime it wont. The way i can tell if it wont start is when the lights on the dash is somwhat dim, and when it is the exact opposit i know i can crank it and it will run. But when its dim it act like there is no juice in the battery but i already checked voltage on battery and it looks good. Also replaced the alternator last year and it seems the output voltage is ok when running. Every so often also the radio would reset itself when brake is applied. If any body have ideas what it would be i would be greatly appreciated.

[Rogue One]

malihini
Have you checked all of the connections for good contact?

[Hilohawaiian]

I have replaced all th batery cables with new had the battery checked and starter seems fine iam not sure where else to start but as far as checking in the engine bay i cant seem to find nothing loose or cut