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post #1 of 3 (permalink) Old 07-23-07, 05:50 AM Thread Starter
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confused Whine on CB/Ham radio

Hi all,

I have a 2004 F-150 & trying to install a CB radio.
I get whine that changes with accelaration. It comes & goes
& sometimes just keying the mic once it will go away. It does come back & seems to return when going over small bumps (but not large ones).
It varies how loud it is...sometimes it's fairly low (but still annoying)
but sometimes it's loud as heck & thats all I can hear.

I've tried 3 different radios, 2 antennas & shielded the power wire. Yesterday I couldn't get rid of it at all. The radio is wired directly to the battery. I can't see any loose connections & had the dealer check all the ground straps etc.

Once it ran great for about 3 days but always seems to return without changing anything. The dealer found a loose battery terminal & fixed it & it helped with some ignition noise but the whine returned after about 6 miles of driving.

The stereo in the truck is fine...no noise or even interference from the CB so what could it be? The dealer is willing to work with me on it...was wondering if there's anything I could give them a heads up on...any ideas? Feel free to ask me any question...I will respond...really wanna get this fixed!

Jim
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post #2 of 3 (permalink) Old 07-23-07, 08:54 PM
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Re: Whine on CB/Ham radio

Shielding the power wire was a great idea. But I'm afraid you might be on the wrong side of the power loop. I'd double check all ground connections first. If that doesn't help, try this: With your engine off, turn up the volume on your CB. Then turn the key to run, not start. Listen for the 1-second fuel pump prime. See if you hear the whine during that 1-second period. If you do, it's coming from the fuel pump. Ford has a TSB and fix on this problem in many of their vehicles, but your's isn't listed. But if you find that yours make the noise with the pump, the TSB is #02-16-4

I'm a retired ASE Master/L-1 Technician. I still keep current with the latest automotive technology. Visit my blog for cool articles and TSB's: http://www.ricksfreeautorepairadvice.com/
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post #3 of 3 (permalink) Old 07-24-07, 09:27 AM Thread Starter
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Re: Whine on CB/Ham radio

Interesting...I did hear a whine for about 1 sec.
I informed my dealer to do what's in that TSB.

I'm keeping my fingers crossed that it helps...way I see it
is it can't hurt right?

Thanks again for the tip !

Jim
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