I'm not a scientist but from my understanding EMP damage is produced from inducing current in wires. The longer the wire, the more amplitude of current will be produced.
Even a modern vehicle has a tiny fraction of the amount of wire than the hundreds of thousands (probably millions) of miles of wire in the power and communications grid. If you are close enough to the detonation for your car to stop running, you have much bigger things to worry about.
*Edit* Think of it this way, the level of EM radiation required to blow out a small circuit would produce tens of thousands of volts in long barb wire fences. If you start seeing fence posts bursting into flames while driving along a country road you should worry.
Last edited by wildcard600; 03-13-17 at 09:03.
"I pity thou, fools who dost not choose BCM" - King Arthur 517 A.D.