Hi!
Just wanted to say that I tend to agree with Ecto on this matter.
Shouldnt you have capacitors between 12V and ground level to get it to work, like in the diagrams refered to in the links?
Dont want to upset anyone here, hope you understand.
Regards
ropo
Edit:
Or just skip the capacitors all togheter, they just there to filter out noise or something (?).