Car stereo turns on and off?

I've bought a Honda prelude 94, i'm trying to install an after market stereo and when I attach the cables to the back of stereo it lights up but as soon as I press "source" to switch to radio it lights up and off… And the antenna aerial goes up 2 cm and down and it repeats. No matter what I press it won't stop. Unless I turn the ignition off.

Just double check your power and earth wiring make sure they are correct try disconnecting the electric aerial power from the radio see if that helps could be a fault with the electric aerial give it a go

Check the ground for the head unit, check all your wiring to make sure it's correct. What exactly is the stereo that you're trying to install? Perhaps it could be faulty, or did you purchase it brand new?

Perhaps it could be faulty, or did you purchase it brand new?

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