I'm trying to fit an internal light to a campervan that switches on when the current internal lights that are are factory fitted come on.
I'm trying to use a relay for this so that when the factory fitted internal lights come on the relay closes and switches on the extra light which is powered from a different battery.
This seems to work, but the problem I have is that the voltage for the internal lights seems to slowly increase from about 7 V to 12 V when they are turned on, which I guess is so they fade in and out. This causes the relay to vibrate as the voltage increases to 12 V.
Is there a simple way to stop this from happening, so that the relay only switches on when the voltage reaches about 11 V?
EDIT - Just to clarify, this is how i've got it setup.
EDIT - Would using this time delay relay on amazon be an easy fix? Am I correct in thinking I could just use this to put a delay of about 1s on it, so that the relay closes after the voltage has reached 12 V?
I'm not sure what it means by a high level pulse signal sent to x1, can someone explain please?