TBH, an "electrical type" noise would be unlikely to be heard by another vehicle, electrical noises just don't get that loud, unless you like to play rap with a silent "C" at ear splitting volumes. Your noise is much more likely to be caused by some mechanical problem.
Since you seem unable to recreate it with the vehicle stationary then it would be reasonable to surmise that your noise is more likely to be caused by a suspension or more likely a transmission fault. When was the last time that the oils were checked and/or changed in the transmission units?
The reason why I said get the vehicle to run correctly in its stock condition first is if you start modifying it without doing that you won't know whether a problem was already existing or was caused by something you've done as a part of doing any modification.
Your earlier posts do make it seem that instead of carefully tracking down a problem, you're just jumping about from one part of the engine to another without making any checks. Oh, and the ABS pump (modulator) is bolted to the inside of the nearside wing, it isn't driven by the auxiliary drive belt.