Audio Hissing When charging/playback in Car

[Velvis]

I have a Mogul and I use that headphone/charger adapter thing that came with it in my car to play podcasts/charge the phone. It all works fine except for the alternator whine.

As soon as the metal of the connector touches the port the hum starts.

Does anyone have any suggestions on how to fix it?

[shaggylive]

you need a ground loop isolator either in the audio connection or a 12vdc noise filter for your charger.

[Cahl]

Have you tried a filter in the audio connection to the stereo system? To be sure its alternator whine, have you tried it with just the audio connected, but not the power?

[weedahoe]

Originally Posted by shaggylive

you need a ground loop isolator either in the audio connection or a 12vdc noise filter for your charger.

Agree with this. Another solution is to isolate your radio to a different ground and keep it less than 12 inches if possible.

[elmerfudpucker]

As a car audio / video installer I can confirm weedahoe sugestion faster than the rest, sure the isolator could help but they also degrade the signal and sound quality unless you get a good one. Check ALL of your grounds, and cheap rca's (if you got amps) will cause it too. Reroute them away from control modules and the amp power wire in the car. Plus if you do have an amp, run the power wire down the same side as the battery, crossing over the motor can pick up noise too. Make sure the grounds are fastened to CLEAN BARE metal and make sure it is secured.

[weedahoe]

I used to be MECP but never renewed it.