Author Topic: Help! Odd dog whistle sound with gauges  (Read 2453 times)

February 13, 2015, 09:18 PM #0

Aaron SVT Offline

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Ok, this is the weirdest thing I've ever heard. Literally.

I have a Kenwood stereo, alpine S speakers, AEM boost and AFR gauges.

I have the ground from the gauges right to the chassis in the engine bay.

I have the positive off of the Stereo. Head unit to be more exact.


I've narrowed it right down. Whenever the wideband O2 sensor wires are plugged in, I get the dog whistle noise.

Interference from the speakers?
Doesn't donit with he boost gauge at all.

@Winter Beater. Only guy I know personally with some electrical knowledge lol

Anyone got any advice? I'm going to run the wideband cable on the other side of the car and see if that does anything.

Battery is relocated to trunk
Positive cable running through the car and ground is 4" long in trunk. Grounded to frame in hatch. (Trunk)

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    Help! Odd dog whistle sound with gauges
    « on: February 13, 2015, 09:18 PM »

    February 13, 2015, 11:00 PM #1

    Bmoney Offline

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    dog whistle?  does the noise increase in pitch with engine rpm?  Without seeing it, I would hazard a guess at a ground loop.   Isolate the 12v wire from the radio and to the ign harness - I bet noise gets better. 

      February 14, 2015, 10:52 AM #2

      Aaron SVT Offline

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      Does not increase with engine RPM.
      So you're saying hook the gauges to ignition? If you wanna come see it you can lol. It's all torn apart in my buddy's garage. I heard that my RCA cables for my sub could be doing the noise. Cause the magnetic field of the signal wires from the wideband interfering with the stereo head unit itself.
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        February 14, 2015, 01:02 PM #3

        Joe Offline

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        The o2 wires should be shielded. If there not, it can induce noise on other wires. Where did you get/tap the power for the wideband and the gauges from? Fusable link?

        Edit: Make sure the power to the instruments is a seperate circuit from the stereo circuit.
        A bad device can backfeed noise into the electrical systems.
        Last Edit: February 14, 2015, 01:05 PM by Joe
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          February 14, 2015, 04:54 PM #4

          Aaron SVT Offline

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          Right now the ground is the cigarette lighter neg cable and the positive is stereo.

          How shielded? What's a good way? What can I use?
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            February 14, 2015, 05:12 PM #5

            Aaron SVT Offline

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            This is my second wideband sensor so its not the device. I'll try aluminum foil to shield the wires. And I'll use power from ignition.
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              February 14, 2015, 10:58 PM #6

              Joe Offline

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              I'd first just try the power from a different circuit.
              Also ground the gauges and wideband direct to chassis or battery direct. Ideally not with other circuits.
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                February 14, 2015, 11:15 PM #7

                Aaron SVT Offline

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                Ok, if I ground it to battery and hook power direct to battery, no noise. Now, I need an inline switch.
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                  February 14, 2015, 11:44 PM #8

                  Joe Offline

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                  Try feeding power from a different circuit with a "add a circuit" at the fuse block. Use a high amperage feed like the rear defroster. It will be ign controlled that way.
                  Ground to the battery or to the chassis near the components.
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                    February 15, 2015, 12:16 PM #9

                    Aaron SVT Offline

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                    I never thought of that, thank you, I will try that
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                      February 15, 2015, 09:08 PM #10

                      TheCanadian007 Offline

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                      Late to the party, but it sounds like you have noise generated from sharing the circuit. I would run a dedicated chassis ground to the O2 and (as aforementioned) try a different switched 12v source.

                        February 16, 2015, 12:53 PM #11

                        Aaron SVT Offline

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                        I ran a dedicated ground to the chassis, now when I get back to the car I'm going to try a 15amp fuse to the ignition.

                        I'll post here how it goes.

                        @TheCanadian007 this Evan S?
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                          February 17, 2015, 12:32 PM #12

                          TheCanadian007 Offline

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                          Originally posted by Aaron SVT
                          TheCanadian007  this Evan S?

                          Who else has a monopoly on Dodge Omni(s)? haha

                          For added clarity, here is the wiring page that came with my Innovate LC-1 wideband.





                          Note what it mentions about grounding locations.

                            February 18, 2015, 02:41 PM #13

                            Stoyka Offline

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                            Originally posted by Joe
                            Try feeding power from a different circuit with a "add a circuit" at the fuse block. Use a high amperage feed like the rear defroster. It will be ign controlled that way.
                            Ground to the battery or to the chassis near the components.

                            Your best bet right here. Except I would double check online (or fuse box lid) to see if your car doesnt already have spare 12v/IGN circuits on the fuse box in the car.
                            Last Edit: February 18, 2015, 02:43 PM by Stoyka
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                              February 20, 2015, 02:42 PM #14

                              Aaron SVT Offline

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                              Ok, tried the suggestion. Didn't work. Found a solution. A relay straight from the battery, to a 15A fuse then to the gauge. And relay will be turned on when boost gauge turns on.
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                                March 11, 2015, 07:43 PM #15

                                Aaron SVT Offline

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                                Wow, talk about inactivity. LOL, my fault. I solve the issue. Went to go see a certain someone at Brian Reimer audio and he gave me the clip on magnets that I clipped around my wire cluster, and now the noise is gone.
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                                  Help! Odd dog whistle sound with gauges
                                  « Reply #15 on: March 11, 2015, 07:43 PM »