Be sure you hood and trunk are grounded well to the main body of the
auto. This is usually done with a short piece of flexible copper web,
well secured at each end.

You should be able to tell the difference in ignition noise and
alternator noise, the alternator noise is more of a whine but with
varying pitch as the engine revs up. If it is ignition, you can get
resistor plugs which are supposed to help. There is also supposed to be
a resistor that can be installed for the alternator whine.

It is often VERY difficult to solve. I've heard of people purchasing a
car based on how quite the radio is on MW / AM. You'd be surprised the
differences in this on new cars of the same make, model, etc.

Al

===============

oan wrote:

I have just made a sony xr ca620x installed to my car which is a
volkswagen polo automatic . I had a blaupunkt before that and it had a
strong noice coming from the ignition and pumps(?). I had tried to
solve this problem for a very long time. Visited, called and e-mailed
vw and blaupunkt in vain. I could not solve this noise problem. I use
MW for BBC world service in 1323 and VOA in 1260 and 792 kHz in
Istanbul. My new sony has the same problem in MW but, suprisingly I
have much less noise on shortwaves which does not bother me at all. I
haven't had much time yet to estimate my car radios sensitivity - I
listened to some weak stations from almost every band from 60 m to 16
m tonight-. It seems as sensitive as my Sony icf 7600D, a little less
selective then 7600D. I am very happy with my new car radio so far.
Voice of Rusiia's jazz hour was marvellous at 22:00 in 31 m band. I
strongly suggest this 620x to anyone who likes to listen to sw
broadcasts while driving.
regards, oan.