Quote Originally Posted by Drew View Post
I tested the bulb (while it was in the socket) by touching the side of the bulb (-ve) (not the socket itself so that I knew that there was some contact) and the wire inside the socket (+ve) and there was power. Should I do it differently ?

I'll check the pins out Patch.

What confuses me is that it flashes when my foot comes off the brake and not on when I would've expected.
That flicking your getting would tend to suggest its poled back to front as LED's will only work with a true positive to positive connection unlike incandescent globes which will work either way as long as there is power & earth.

Go back & check the light socket itself (without the globe in) as Yendor suggested & see your getting positive power at the 2xcontact points in the bottom or on the side of the socket wall.