Why don't you practice flexing on spectrums that affect electricity?
(stay away from your PC though, cause that is expensive to fix)
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If you concentrate/coalesce/compact your influence field you'll notice lights tend to turn off momentarily.
When you know what kind and type of field flexing makes the electricity turn off, visit your local intersection and try the same effects on a general area.
I don't know what you field is like anymore, but try to contain it to a fixed area so that you have the greatest chances of affecting onboard electronics in cars passing by.
If I recall correctly, I noticed that concentrating/coalesce/compactifying your personal field on cars (while not in motion) and directing the field to rise/offset about a foot upwards seems to cause the car to die on the spot.
Recall the field back to you and the car will usually turn on again. Though, I noticed some parts of the car tend to hang on to the influence field charge so you have to also use ESP to manually check the cars internals to make sure all of the field is recalled back to you.
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You can think of it as a focused area wide concentration of your field. Maybe you can have someone else outside the field effects taping you to prove you can turn off strangers cars on command. It'll be funny at the least.
Just make sure you keep your field away from the camera otherwise you'll screw up the electronics on it. I also only did it on parked cars waiting on the intersections. I was warned never to do it on a moving car as the person will lose the control or the car might lock up. (dunno if that true though)
Maybe you could do it and see if anything actually happens when you "affect" a cars onboard electronics while it is in motion.
The people inside the car *shouldn't* be affected as their consciousness and organics work a bit differently. Though I noticed it takes more effort to make people momentarily blackout and it requires being pretty darn close to them.
Most people lose sight for a few seconds at a time. I am unsure if they lose hearing or not. So test with their permission or in a safe environment.
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Also you should visit a local substation and (stay clear distance wise) and try to affect the electrical pattern at the substation.
I was always afraid to do that because I am unsure if the substation would arc or not. I also can't stand sensing the intensity of the "influence" pattern thats represents high voltages.
Worst that can happen is small fire. Maybe a blackout.
I heard someone in the RV community was tasked to do such things a long time ago. So I assume it is doable. Just keep in mind technique is more important that the quantity of influence. Create an abnormality in a system and the rest of it tends to go out of whack until you pull your influence back to you.
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Also be careful not to damage the underlying pattern that describes a physical object and its properties. Otherwise abnormal physical effects will follow.