I have a 73, 750 roadster that I am having a very strange problem with my signal lights. I obtained LED replacements for the signals light lamps,from a company that specializes in British spares. (they have been great). I am working with them also. I replaced the rear two, checked their operation, which was perfect, then moved to the front. When I checked them after the installation, all four lights came on, steady, no blinking, without the signal switch being activated. So, I removed the new LED's and replaced the fronts with the old bulbs, again, they worked as normal with the rears being LED and the fronts being standard bulbs. Thought it may be something with the Flasher as I had an HD unit in that was rated up to six bulbs. Replaced it with a "normal" flasher rated for four bulbs. Tried it again. Still same problem. I would prefer to replace all with LED's, as they really are SO much brighter, but I can deal with only two if I can't figure this out. Thanks in advance for all of your help.