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sound when anything is plugged into cig


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6 replies to this topic

#1 theflystyle

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Posted 13 November 2005 - 05:02 PM

I am having this issue with anything that gets plugged into my cig lighter for power, my laptop or ipod when plugged in and playing either on the laptops on speakers or from the ipod to my stereo creates a loud and annoying hum or poping sound. i noticed that with my ipod, when i accelerate on the gas the sound in turn accelerates and makes a sound that i can only describe as a "turbo winding up"...

my thoughts... would i be wrong to assume this is a grounding issue?

any input would be appreciated

-ali

#2 Storydude1

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Posted 13 November 2005 - 05:27 PM

I am having this issue with anything that gets plugged into my cig lighter for power, my laptop or ipod when plugged in and playing either on the laptops on speakers or from the ipod to my stereo creates a loud and annoying hum or poping sound. i noticed that with my ipod, when i accelerate on the gas the sound in turn accelerates and makes a sound that i can only describe as a "turbo winding up"...

my thoughts... would i be wrong to assume this is a grounding issue?

any input would be appreciated

-ali

Ground it is.. Check your wiring on your aftermarket radio. Ground the radio direct to a underdash metal ground.

Of course, it could be noise picked up from the powersupply plugged into the lighter.

#3 Cougar

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Posted 13 November 2005 - 07:41 PM

The sound you hear is whine from the alternator. If the grounding is ok you may need to add a filter to stop this.

#4 theflystyle

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Posted 14 November 2005 - 03:28 PM

good to hear that the cause is what i had presumed.. ill check ground and whats the deal with that filter thing you were talking about??

#5 Cougar

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Posted 14 November 2005 - 05:42 PM

A filter can just be a capacitor tied between the power lead and ground or a choke coil in series and a cap to ground. The cause also may be due to a bad diode in the alternator.

To see if you have a bad ground lead causing this you can run a lead directly from the negative battery post and to the component ground that is having trouble. If that doesn't remove the trouble then the noise is coming through the power wire most likely. You may be able to use a 1000 microfarad capacitor @25 volts connected close to the power input of the device and get the noise out. Be sure to observe the polarity if you do this.

#6 subie94

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Posted 14 November 2005 - 08:12 PM

i'm getting the same thing(popping) when ever i shut off my aux lights.i get a pop out of the speakers.mainly out of the subwoofers though.i wonder if it's cause both the amp an lights are hooked up to the battery for power source(should of did a fuse tap for the lights)

#7 Cougar

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Posted 15 November 2005 - 12:53 AM

Both of the loads have to be tied to the battery any way you do it. The noise is most likely coming from the light switch. You could try placing about a 100 microfarad capacitor across the switch. Be sure to watch the polarization of the capacitor.




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