Originally Posted by Jma20a
no one in their right mind would "draw power for the amp from the head lamp constant power"
i would like to see your amp cable picture.
Well, maybe the installer wasn't in their right mind.
Because, according to the OP, the amp is making the lights go out, so it is clear that they must have wired into the headlights. Only the amp needs constant power, not the HU.