Bought switchbacks for my stock headlights, I wired the load resistors in and all was good. When I swapped to my retros and wired in the load resistors again and now one bulb doesn't switch to amber when I put the indicator on, it just stays the (blue/white) colour. Both sides are wired the same but only one side flashes amber and the other one doesn't. Any help would be greatly appreciated.

 

Flip bulb around?

 

Tried, no change. Any other ideas?