This is an interesting thread! im kinda new here and typically just researching failures but ill drop my .02.
So in the late 90s I was working for SAIC as a contractor our primary task was CTBTO monitoring, my job was supporting the hydroaccoustic cables as a diver, but i got to do lots of cool gigs. One such gig was out at Nevada test site testing EMP proof vehicles, My job was to support. I have no engineering background. We had 20 vehicles mostly newer military 5tons, Humvees, powercarts, and similar we also had from somewhere an old M38 (mid 60s) a 70 225 crewcab W200, a Ford box truck with an IDI, and a F350 mid 90s powerstroke and a couple of chevy milrated C30 type rigs mostly 6.2's. They had a machine in a connex box that had some crazy ass Frankenstein looking antenna(s), and a barrier around it. It was quite controlled testing with a bunch of guys in hardhats and white button shirts. They would pulse the vehicles with (im guessing here, cuz they did it at night after we cleared out and we would check stuff next day) the connex box had a big mil gen set with some really long power cables. Long story short we totally fried the hertz rental suburban we had. the older rigs succumb to some minor failures, mostly fried points condenser's and alternator/voltage regulators, mil vics no issues except one of the older power carts that had a pinto gas motor in it. I dont remember all the details it was just a boondoggle for me, the one thing I had to do was drive big ground rods down and attach em to the frames with a 1.0aught ground cable. That seemed to be the ticket. I loved bombing around in that Jeep and the old crewcab W200. And I still wonder what the Hertz mechanics thought when they had a suburban with absolutely every component fried. My take away from talking to some of the hard hat dudes was stash your set(s) of critical components in microwaves (faraday cage) and ground your vehicle when you park it.