H'mm bit of a touchy subject with the boss at the moment.
As you can imagine a new voltage regulator,battery and LV system ain't cheap
Had a read of the link but it doesn't go into enough detail.
Thanks to the ppruner that PM me who suggested that I take the bulb out. But it doesn't really fix the problem.
If the low voltage system detects current flowing out of the battery maybe its picking up a residual eddy. So a small resistor in series will sort that out.
To be honest after my fights with various electrical problems with cars I can understand the problems the Engineers are having.
I have tried swearing at it in Doric, English and German, unfortunately it didn't work.
MJ