Good points - but
I was planning on checking all three of those things. I think I have the LED the right way round - leg by the flat on the side being +. I don't think I have any spare whiskers (except my beard) - but will check again, not much spare room inside an OBD plug. I connected to the points indicated by tiny numbers on the PCB inside the OBD plug since the ready-connected ones had sold out. I had to get a magnifying glass to read teh little bathmats!
I think first step will be to put 12 volts directly onto the LED. Next step will be point-to-point checking with a multimeter.
But I am supposed to be working.
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