SORRY. APPARENTLY THE REFLECTOR CHOPS OUT QUOTED TEXT EVEN WHEN IT
IS CRITICAL TO THE DISCUSSION -- SO HERE IT IS AGAIN WITHOUT THE
QUOTES. HOPEFULLY IT WILL GET THROUGH THIS TIME.
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 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 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 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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