f 350 diesel severe interference

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soundnsecurity

Gold - Posts: 2,711

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Joined: November 10, 2008

Location: Louisiana, United States

Posted: June 15, 2009 at 9:18 AM / IP Logged

have you checked if the noise exists on all sources of the radio?

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nfrank89

Copper - Posts: 86

Joined: April 30, 2009

Location: Washington, United States

Posted: June 15, 2009 at 6:24 PM / IP Logged

thanks guys i'll try these out

nfrank89

Copper - Posts: 86

Joined: April 30, 2009

Location: Washington, United States

Posted: June 16, 2009 at 6:06 PM / IP Logged

Okay:

-i tested the rca shields on the deck and amps with my meter and they are good.

-the interference is in all modes of the head unit(ipod fm am)

-when i turn on the parking lights and turn the dash lights dimmer all the way down i get a second buzzing sound that is much louder (video included)

-when i disconnect the amps the buzzing goes away (its not the amps)

nfrank89

Copper - Posts: 86

Joined: April 30, 2009

Location: Washington, United States

Posted: June 16, 2009 at 6:47 PM / IP Logged

i disconnected all the wires that connect the deck to the factory wiring (B+ ACC and dimmer)it still buzzed. i ungrounded the parking brake wire and the buzzing remained with only the ground wire connected. i cut the ground wire and connected it directly to the -battery terminal. still buzzed.

i am an idiot

Platinum - Posts: 13,709

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 16, 2009 at 7:41 PM / IP Logged

Take a short length of wire, ground one end and briefly touch the other end to the shield of one of the RCA cables. It will be best to try this behind the radio, not at an amp. Let me know if this makes a pop in the speakers. Also let me know if this affects the noise even a little bit.

KarTuneMan

Platinum - Posts: 7,056

Joined: December 14, 2004

Location: Isle Of Man

Posted: June 16, 2009 at 10:23 PM / IP Logged

i am an idiot wrote:

I plead the 5th. You will have to make that call. Following are the search results for pioneer noise there are 361 topics that meet that criteria.

https://www.the12volt.com/installbay/search.asp?KW=pioneer+noise&SM=1&SI=PT&FM=0&aid=199561&OB=1

He shoots...........HE SCORES!!!!

nfrank89

Copper - Posts: 86

Joined: April 30, 2009

Location: Washington, United States

Posted: June 16, 2009 at 10:44 PM / IP Logged

i actually soldered wires to the shields and grounded them to the back of the HU and still got the interference, nothing changed, no pop. and the ohm meter read less than 1 ohm. i suppose i should try hooking a speaker directly to the HU?

i also ran wires from the unit to the pos and neg batt terminals and still got interference. :(

nfrank89

Copper - Posts: 86

Joined: April 30, 2009

Location: Washington, United States

Posted: June 17, 2009 at 12:13 AM / IP Logged

let me explain my ohm reading though... i think my digital meter needs to be re calibrated or something... im not sure if its possible to re calibrate digital ones. it's a FLUKE 77 from the mid 80's, i got it from my dad. when i turn the dial to ohms and connect the leads it says around 54.00 ohms then slowly counts down. when i tested the shields it gave me the same reading so i assumed 54 is zero.

nfrank89

Copper - Posts: 86

Joined: April 30, 2009

Location: Washington, United States

Posted: June 17, 2009 at 1:06 AM / IP Logged

$10 pay pal to the one who solves the problem :)

i am an idiot

Platinum - Posts: 13,709

Joined: September 21, 2006

Location: Louisiana, United States

Posted: June 17, 2009 at 6:13 AM / IP Logged

I would be willing to look at it for you and not even charge you the 10 dollars, But the 141 gallons of fuel required would be a bit costly for you. I have no idea what is up with your meter. Fluke makes the most reliable equipmant out there. I remember you said you connected both radio power wires to the battery. Have you tried connecting them both to the capacitor?

Do you have access to another meter? Or use that one, set it to AC volts, stick the leads into a wall outlet. (Of course make sure the leads are in good shape, no metal wire or probe exposed)Notice the reading. If it reads near 120 volts, It may just have a problem with the ohms section. With the truck running, black lead on chassis of the radio, check the AC voltage on both the red and yellow wires of the radio. Also at the amps. Black lead on ground terminal of amp. Red lead on power terminal of amp. Pay close attention to the display, it may read 100 or so, but it will turn on MV (for MilliVolts). Let me know what you find out. 3 voltages Radio's red and yellow and amp power.

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