I've tried a couple of LED BA9S Canbus bulbs as replacements for the standard maplight bulbs.

Unfortunately neither have worked.

Has anyone got the details of any that they know work and where they were purchased from?

Thanks
Simon

To make them work, you must inverse polatities.

I wasn't sure how to do that as they are bayonet fittings?

turn them round  When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car

I suspect these are bayonet bulbs with one centre contact and one contact around the bayonet part of the base. I.e. the polarity is fixed!

Yes they are. Hence my original question

The socket is to be modified, to inverse polarities. I tried to do this but for the moment I dropped it. Anyhow when I was investigating why LEDs are not working I inverted life + and - . It was working fine, but problem appeared how to connect door operating +.

Can anybody help?
I've fitted a Ford Focus front interior light and want to change the bayonet type standard bulbs for LED's
I'm guessing that they work on battery voltage direct such that Canbus error free isn't needed.
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Please can somebody direct me to a bulb spec and supplier?
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I've changed the festoon for a 4 led type non Canbus and am not impressed. So of a member can direct me to a better led festoon I'd appreciate.
Kind regards from Fred 2010GS Auto ex Celeb, Santorini Black, 2011 facelift , spoiler, spats, mudflaps, LED footwell lamps, Witter detach,
Other cars:-
1958 & 1959 Austin J40 Pedal Cars under restoration (I make many J40 parts)
If you have an Austin J40 or Pathfinder Pedal Car looking for a new home pls PM me.
2009 Meriva