Thanks again cornblatt, v helpful.
Your description sounds a bit like mine, will hone in on this when removing tailgate door card.
"The internal switch was flaky on mine - it was getting into a state where it was in between the two contacts, so neither contact was closed. At that point the whole thing is dead and will never ever work until you open it up and reset it (or until it magically decides to flex into the right position again due to bouncing down a bumpy road or slamming the tailgate or something)."
Checked several times for any draw, started as above but then without doing anything apart from re-testing it eventually went down to 0.01 - hopefully not doing something daft with multi meter, assume the read out is in milliamps?
