Aux Input interference from Cig Lighter

[Tyson1980]

Hi guys,

I'm new here, so please be patient. If this is the wrong section for this topic please move it accordingly..

I have just installed an AUX cable in my Z4M and when i have the phone and charger plugged into the AUX and cig lighter at the same time i get an interference through the speakers.

I started reading up on the issue. Some recommended wrapping the cable up in Aluminium foil and other said maybe i needed a resistor???

Any advice?

[clabcon]

You need to shield the dc electrical and audio signal cables. My bet is that signal cable to aux IN is only a thin wire with a minimal amount of shielding. Try taking the centre console out and studying the wiring and routing the aux signal cabling away from lines carrying switched and permantly on live feeds (usually yellow and red wiring colours). If not possible shield both cables, alu foil might work if its thick enough although copper would be better.

ETA: Does your car have a bluetooth option?

[va1o]

You need a ground loop isolator I think, e.g. http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&am...

[clabcon]

va1o said:

You need a ground loop isolator I think, e.g. http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&am...

Pay careful attention to the guarantee that says it won't work, the Chinglish "Loose the noise, gain sound quality" and the International shipping from Hong Kong, which will cost you a bomb in shipping/import fees. IMHO ignore that and sort the source of the problem, rather than just trying to mask it.

[rottie102]

clabcon said:

Pay careful attention to the guarantee that says it won't work, the Chinglish "Loose the noise, gain sound quality" and the International shipping from Hong Kong, which will cost you a bomb in shipping/import fees. IMHO ignore that and sort the source of the problem, rather than just trying to mask it.

Just out of curiosity, nothing to do with the subject - you are really bothered about warranty on £3.99 item?
And £1.99 for shipping is "a bomb"?

[Parrot of Doom]

Powering the car's radio and the phone charger from the same electrical supply would probably solve it. Right now you have a small PD between the two power connections, get rid of that and you should be sorted.

[clabcon]

rottie102 said:

Just out of curiosity, nothing to do with the subject - you are really bothered about warranty on £3.99 item?
And £1.99 for shipping is "a bomb"?

More about the 1/2 a month you wait without the problem being solved for junk like that to arrive, when you could fix the source of the problem properly in 10-15 mins in the first place!

[Ozzie Osmond]

clabcon said:

IMHO ignore that and sort the source of the problem, rather than just trying to mask it.

+1