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A bypass Capacitor Simply means a capacitor to bypass the non DC voltage to ground and eliminate it. A small capacitor about cents at radio shack soldered between the Plus lead and ground will do the trick. Radio shack should have a filter kit with a suggested capacitor value of 25uf at 50 volts DC in it. I probably have some ferrite's here and Will send you some if I can find them. Also don't want to bring up the AirBag stuff again however the "Initiators" used are somewhat sensitive and having a lot of RF floating around could be unwise. So the filtering and shielding is still a good Idea.

Quoted Info:

Airbags
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Airbag applications in the automotive industry have always presented a unique challenge for filter applications. The igniter system for an airbag must be filtered to prevent a misfire. An ideal filter for this application must be able to contain voltage surges as well as prevent RF current from reaching the ignition bridge wire that fires the airbag. The chance of RF interference has increased with the large number of electronics in the automobile itself as well as from other devices, such as cell phones, that are in close proximity to the airbag wires. As these devices function at higher frequencies, wavelengths shorten and the airbag wire length becomes more attractive for coupling of the RF energy, increasing susceptibility. However, at higher frequencies, today's filter components are inadequate, requiring more parts to regain the lag in filter performance. Designers need a filter that reacts at faster speeds without adding prohibitive costs to their designs. A single X2Y component can provide this capability, offering a cost reduction and space saving solution for the automobile industry.

Controls, Sensors & Networks
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Automobiles are dependent on electronic systems for safety, operation, and comfort. Antilock braking systems (ABS), airbags, and automated emergency assistance alert systems rely heavily on control sensors and networks. The engine and fuel injection systems are managed by the engine control modules. Climate control, mobile phones / fax, TVs also use DSPs.

These modules, sensors, and electronics are susceptible to EMI noise bursts from other modules or devices within the car. Crippling transient voltages and static noise (cross-talk) that affect many of these systems can be mitigated by using X2Y devices, in most cases, with a single component. X2Y devices improve the function, simplify the design, and reduce the costs of automotive control sensors and networks.


Final reading:

http://www.hamuniverse.com/rfi.html

And here is a single unit to put into the power line.

http://www.jcwhitney.com/autoparts/ProductDisplay/s-10101/p-170/c-10101


FYI DON :D
 
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