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StuartWaite
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StuartWaite's post in 1st Boxster, 1st Problem was marked as the answer
Bingo
Thanks Wizard
I assumed that as I didn't have fore/aft positioning or memory buttons my seats were pure manual - WRONG
You pointed me in the right direction and I now know that even manual seats have power backrest controls supplied by E3 for the left seat and E4 for the right. Further inspection showed that the left seat back switch was stuck on thus trying to drive the backrest to the fully to the rear and was responsible for the strange cyclic current drain. I guess the motor control circuit was obeying the command from the switch and trying to move the seat, failing as it was already full travel, aborting, then re-trying on the next timeslot. As both these fuses are hot even with the ignition off the battery didn't stand a chance!
In my defence I found fuse E4 was actually blown and so the control on the right (drivers) seat was not working reinforcing my assumption that the seats were manual only!
I have replaced both fuses E3+E4 and played about with the switch and it seems to be working fine now. Quite a simple fix in the end and no nasty air-bag incidents :-)
Thank you for taking the time to read my posts and for reading between the lines and intelligently coming up with the right answer - well done
Well done to also to Chris H1 and Daz85Lux of the TIPEC forum who were both correct and helpful.
Cheers
Stuart