James,
Describe the noise for me.  Is it a high pitched whine, that increases in
frequency the faster the engine runs?  If so, it's called alternator whine
and should not be occuring in a car made after 1984.  For older cars, you
need to add a noise surpressor.  It's also best to connect your hot wire to
the CB radio directly to the battery through a fused link and not to the
ignition since it requires a bit more current than the the AM radio.  You
can also find an excellent discussion of automotive interference solutions
at the Amateur Radio Relay League's (ARRL) web site at
http://www.arrl.com/tis/info/rfiauto.html and even download articles, some
free of charge.

Bill Ward
'86 GL
W4PCK

At 08:50 PM 5/9/98 -0400, you wrote:
>Need Electronics advice/info
>
>I'm tired of getting Noise on my CB and AM radio in all my vehicles.  The
>noise is coming from the engine, but I'm not sure (yet) if it's from the
>ignition system or the alternator.  I have supressor spark wires and
>(maybe) cap and rotor.
>
>What works?  Before I start buying "noise suppressors" from Radio Shack et
>al. can anyone give me a primer on what I need to do?  Specifially, is it
>more likely that the noise is coming through the power wire, or via the
>antenna(s)?
>
>Thanks for any help.
>
>James
>
>