Every time I start my car at night every lights keeps dimming/flickering headlights brake lights interior lights

Hello, changing parts without testing is not a good idea. Did you test the alternator output for both amperage and voltage? Have you ensured you have a fully charged battery in good condition and able to handle a load? Your battery needs to be in great shape to ensure solid electrical power at all times. If your alternator output is great and your battery is great, check all wiring to ensure all cables and wiring is connected securely and has no corrosion, and that the wiring connector at the alternator is clean, not overheated or melted, and the terminals are perfect.