Realizing this is not the same model and older than my Escape, I
think the comment below is worth checking into. So when I get a
chance I will try to measure the resistance from the radio case to
the battery (or frame near the battery).
But based on additional (direct?) comments I am going to look at the
ignitors and spark plug wires using a separate radio to see if, in
fact, that is the problem. At least the symptoms better match this
source than some of the other suggested sources.
Thanks -- John W0UN
>>Vehicle: 2003
>><http://www.fordforum.com/forum/showthread.php?t=19711#>Ford
>>Explorer Sport with stock radio/tape/cd player. Went to Mossey Ford
>>and they said radio was working within specs. (Yeah right). On
>>weaker am stations found radio almost unusable because of ignition
>>noise that followed the engine rpm but almost went away at idle.
>>Pulled antenna mast and cleaned with steel wool. Did not help.
>>Pulled radio and put a 1 microfarad cap across 12 volt to ground
>>leads into radio. Also pulled all connectors and reseated. Also
>>tried a filter cap across the 12 volt to ground on the alternator.
>>Nothing helped.
>
>
>I am not sure of how this factory radio was originally installed
>since I bought the
><http://www.fordforum.com/forum/showthread.php?t=19711#>car used but
>I noticed there were two places on the back of the radio's steel
>case where a grounding wire could be attached and neither were used.
>The case was secured by the the 4, Ford
><http://www.fordforum.com/forum/showthread.php?t=19711#>style side
>clips which only touched the plasic portion of the dash. I measured
>the resistance between the case and a steel interior frame support
>and found several ohms. Between that support and the negative post
>of the battery had 2 tenths of an ohm. So I attached a heavy gauge
>grounding wire from the frame point, which is above the gas pedal
>and already had a nut and washer, to the grounding terminal on the
>back of the radio. The static on even distant am stations is 90% reduced.
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