Unshielded 3.5mm cable problem

[dkl_uk]

Hi

I've got a ubox mini pc in my car under the drivers seat, a CDA-X001 Alpine head unit and i've just bought a CD changer to 3.5mm converter cable to find out it was too short so ended up going to Maplin to buy a female to male extension cord. Now my carputer is connected to the head unit via the CD changer converter.

Initially the cable worked and I could hear audio, but given 10 seconds the audio faded out and was replaced by a bubbling humming noise clearly relating to the power supply on the PC.

This was the only cable I could find, so how do I now shield this cable enough to be able to hear audio from my computer again??

Thanks

Danny.

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[Blazemaster83 10+ year member]

better quality cable might work, how is the computer being powered?

 

[dkl_uk]

A 1000W 12 to 240V converter crocodile clipped to a 1.2Farad power cap...

All the cables i've found on eBay and other places is just the standard crappy thin cable with the black sleeving. Should I just wrap it in tin foil and hope for the best?