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  1. US6x4

    VIC-3 whistling noise with Engine rpm

    Well, thank you! I took my time on it and it turned out nicer than I had hoped. Here is the writeup I did on it awhile back: https://www.steelsoldiers.com/threads/vic-1-intercom-panel-for-soft-tops.188122/
  2. US6x4

    VIC-3 whistling noise with Engine rpm

    FWIW...I ran my ground cable from the AM-1870 attaching bolt (1 of the 4) to the same battery ground terminal that the AM-1870 power cable was wired to.
  3. US6x4

    VIC-3 whistling noise with Engine rpm

    Thanks! - I like it. Here is the write-up I did on it a while back.
  4. US6x4

    VIC-3 whistling noise with Engine rpm

    Side note: I added a 6 gauge ground cable back to the battery and that cured the whine in my VIC-1.
  5. US6x4

    VIC-3 whistling noise with Engine rpm

    That would help a lot since, after looking back, my 1780 has rubber spacers between it and its panel...
  6. US6x4

    VIC-3 whistling noise with Engine rpm

    When you say "main control box" are you talking about the truck's PCB or the AM-1780?
  7. US6x4

    VIC-3 whistling noise with Engine rpm

    Does anyone know of a good heavy duty filter that would eliminate that noise?
  8. US6x4

    VIC-3 whistling noise with Engine rpm

    I have that same sound in my M813's VIC-1; kinda sounds like the truck has a turbo. Would a filter simply wire inline with the positive cable for the 1780 amplifier?
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