Not sure if I'm missing something about PT's, but doesn't metal, i.e. the aluminum chassis, not act like a sheild against RFID? Or at least reduce it's performance? Don't know if this relates to your electrical issue either, but just a thought.
How directional is the MyLaps/AMB PT's RFID signal?
That might help suggest why a PT on it's side works better than one on the floor of a metal chassis'd car, as on it's side it would be transmitting out of the top of the chassis/sheilding.
When I've designed things with RFID systems in them I've always had to make sure there wasn't anything metallic between the transmitter and receiver...not sure if these PT's behave the same but not sure why they wouldn't be?
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