I have an 05 LGT 5MT with a Jazzy Engineering mod
to the stereo for an aux input.
Here's the problem I have. When playing music from my phone using the 3.5mm aux jack, everything sounds fine. However, when I charge the phone using the cigarette lighter/DC power port in the console and play audio from the phone through the aux jack at the same time, I get a high pitched whine in the background that increases with the speed of the engine.
Overall, this wouldn't be a big deal, as I very rarely need to charge my phone while playing audio from it. Problem is, a recently got a bluetooth audio receiver which I installed in the console and needs to be powered all of the time through the DC power port. I really like having bluetooth connectivity and it works great, but any type of audio signal coming from a device also powered through the DC port has the same whine.
I'm guessing this is some kind of electrical interference, probably related to grounding of the power port. Thoughts?