12v Cigarette Outlet ground issue?

[bmwzzzz]

Hey all!
I recently got an iPhone cable which splits into a USB input for power to charge the phone, and a 3.5mm output to connect to the Aux input for the car.


My only issue is that when the USB end is connected to a cigarette lighter USB charger, there's a ton of audible noise/interference which makes it unusable.

I am assuming this is coming from a ground issue. Anyone have experience with this and any advice on what to check? I'd like to solve this at the source rather than getting a bluetooth receiver option.

 

[inkey$]

Sounds like you need a ground loop isolator to go between things...
https://www.amazon.co.uk/Smof-Ground-Isolator-System-Stereo-Black/dp/B0171PQLB8/ref=sr_1_1_sspa?keywords=ground+loop+isolator&qid=1682354474&s=electronics&sprefix=ground+loop%2Celectronics%2C100&sr=1-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1