True -- but it might help verify that it IS that -- or not, lol. If it was external it would still abate, wouldn't it? Nevermind...

 

Your saying to pull a wire off the EDIS one at a time and see if the noise goes away, right? This is assuming that without the wire, there is no path to ground through the plug therefore it wouldn't arc wherevever it is arcing? Am I right?

 

If you pull a wire off and it changes it, you're probably on the right circuit. Whether it's on that leg or not, that leg is part of the radiator and resonant circuit and the noise will change substantially when you get on the right pack -- I THINK, lol.

 

While we're on this topic, how much does a new EDIS coil pack cost? Ford Parts Online shows a distributor for $101.00 but obviously I don't have a distributor.

 

I don't know, Matt. How about a JY part? Could be real cheap and worth trying for testing? I'm just cheap, though, lol -- I know a new part is preferred especially for an emergency responder.

 

In my Ranger I have run several different radios and the RF noise varied depending upon the radio I was using. RCI Ranger 6900 FTB, RCI 2950 DX, Kenwood TS 50S, and most recently a Cobra 148 GTL (Malaysia '97 model).
The steps I have taken to remove the RF and engine noises....
Run 12 gauge wire power wires from battery to radio with dual fuses (battery acts as a GIANT noise filter), shield and ground power wires, replace RG-8U coax with double shielded LMR 240, install flexible magnetic material between the Wilson 5000 magnet mount and the roof for better DC coupling, replace the factory old factory platinum spark plugs with factory new platinum spark plugs, and replace factory plug wires with Taylor Spiro plug wires.
With all of these changes.... there is still a slight alternator whine and under heavy acceleration there is an ignition popping sound. Soon I will replace the factory 95A alternator with a 130A or possibly a 175A which may alleviate the remaining alternator whine.

OR 4x4

 

I was surprised on what the new alternator did for mine, Charles.

Well, all my antenna's are mounted right to the body but one -- so your right and anything you do for ground coupling is good.

I've run 8 ga back to the radios and what not (overkill but it also feeds my Bazooka tube). I advocate (as you apparently do also) running a ground and NOT relying on the vehicle chassis for power ground.

I've seen various spiral core wires, and I might try the ones you mentioned. The ferrite snap-ons helped a bit.

I put Bosch platinum +4's in and no increase or decrease in noise that I could tell. Engine seems to run exactly the same.

 

None of this noise is being picked up through the power circuits and none of it is alternator noise. It is 100% radiated RF from the ignition and it is being picked up by the antennas. Coax and shielded power wires won't make a difference. I can stand outside the truck with a portable radio 3 feet away and I still pick up the noise. I already have 10 gauge power feeds, master bus and sub circuit fuses, and professional two-way radio noise filters on the power circuits. OR4x4, everything you suggested is really good advise but unfortunately I've been-there-done-that and the problem is beyond that.