Subject: Re: Engine Start/Shutdown Noise Spikes From Automobile


Hi Jim,
I probably should have mentioned that once the car is started there is no=
 noise. So I've ruled out ignition EMF.
The noise spikes are only present during initial startup and upon shutdown=
.. They only last a fraction of a second. That's why I think it comes from=
 the alternator field building on stratup and collapsing on shutdown.
Richard




Hi Richard,

    Check the starter motor and the very heavy duty solenoid switches whic=
h control it,

    Regards,

    Chris Chapman







Subject: Re: Engine Start/Shutdown Noise Spikes From Automobile







Hi Jim,


I probably should have mentioned that once the car is started there=
 is no noise. So I've ruled out ignition EMF.


The noise spikes are only present during initial startup and upon shu=
tdown. They only last a fraction of a second. That's why I think it comes=
 from the alternator field building on stratup and collapsing on shutdown.=



Richard











Hi Richard,


 


    Check the starter motor and the=
 very heavy duty solenoid switches which control it,


 


    Regards,


 


    Chris Chapman