[Early_S_Man]

Jon,

No, only one bulb at a time is supposed to illuminate. That's the way the factory wanted it, anyway ... some of us have other ideas, but svae that until you have them working 'normally' as the factory intended!

I am not sure why you feel you have to disassemble them again ... but it's better entertainment than a Rubik's Cube, anyway!

A new bulb can't be 'ASSUMED' to be good ... test it! Then test power at the bulb connector as I already suggested! There may be a corrosion problem at one of the ground strap 'multiple' connections.