I’ve recently installed LED lights into my car and hard wired the led strips to each door however the only door that’s working is the drivers side where the main switch is. The other doors are blinking but then turn off. Is this down to the power and if so, how can I overcome this issue?

 

Welcome to AAC!
We're not psychic. You need to provide a lot more information. For starters, what car make and model? How exactly have you connected into the car electrical system? What was there before you added/modified the lighting?

 

If one door is working okay, then copy that wiring method to the other door, if so then it must be cable size and not enough current possible, measure the voltage on the leds.