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This looks like a great idea for building speaker or amplifier stands out of recycled pallet wood for musicians.
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I did not break the jack mount. The wire harness fell out of it and it was considered the result of "tampering". Because of this I failed emission testing. As this was the case, if you mess with your OBD-II harness it may be considered to be emission system tampering. Plus, it was never designed to carry a 18-40 Watt load.
Good reply, but you forgot the part when the tape unravels due to the heat/wear & tear and gets caught up in the steering column control stalks. Also, I don't think it is a good idea to be pulling 18 to 40 Watts continuously though a slip ring commutator meant for intermittent pulses to the cruise control logic circuits or the horn relay. You were nice however just to refer to it as a kludge.
"Easy 12V power" ?? The OBD-II jack is a data output port and was not designed to supply power to a heater. If you burn out your interface and cannot pass your emissions test it is on you. I got dinged for "tampering" because the jack fell out of its mount and the technician couldn't plug into it.
How about a bit of fluorescent dye and a UV LED ?