When you first start an AUTO like 50 or more amps
might flow through the starter motor creating a large
circuit for an electro magnet ??



-----Original Message----- 
From: Richard Schneider
Sent: Thursday, January 06, 2011 2:38 AM
To: psnlist@..............
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




On Wed, Jan 5, 2011 at 3:32 PM, Jim Santee  wrote:


Go to a professional two way radio shop – NOT RADIO SHACK – and purchase an ignition noise suppression kit. Some professional marine 
dealers have these as well. What they usually consist of are high quality by-pass capacitors placed on the alternator and ignition 
module. One point: Check with your automobile dealer service department to ensure you will not void your warranty or damage your 
ignition system. Thirty years ago this would not have been necessary as there were no computers or sensors in the electrical systems 
of cars.



Police cars have radio interference problems so these kits are fairly common. Finding a kit for your car should be easy.





Jim Santee




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