High pitch squeal when using portable dvd player

[bigcheesoli]

Hi guys - first post here...

I bought a portable dvd player a few weeks ago to temporarily keep the kids entertained, but have a problem when using the car charger with it...

When I connect the audio through the stock head unit, AND connect the car charger to the dvd player i get a high pitched squeal through the speakers, and it seems to change pitch with the change in revs.

Can anyone tell me how to get rid of this problem??? We had a hire car over the weekend and didn't have this problem with the hire car - so its not the dvd player...

Cheers!!

[MrNutter]

Sounds like alternator interference. The wire to the cigarete lighter probably runs too close to the alternator. Try moving it further away from the alternator & see if that helps.

[StoneX]

I get the same thing with my iPhone. I just charge it before taking it in the car if I want to listen to music. The stock head unit doesn't seem to like connecting to an audio source that's connected to the cigarette lighter plug. I don't know of a proper fix