Don't know if you were talking to me? Anyway, the outer chrome part was bought second hand from a car been broken. The inner part that came with it was shot. It did not have all the luggs to hold the surround in place and the key hole did not take a key anymore. More like a screwdriver.Nice, home made? 😲
Lighter sockets supply 12V DC - so can't see this can be the cause of your problem (if I understand you correctly).
Yes or I could have included the electrics inside the plug. It was just a moment of thoughtlessness.If you want to hardwire the camera into the car you need a buck converter and then set the required output voltage. Buck converters can be picked up for a few pounds.