Originally Posted by 250senuf
A solid state flasher (non-load dependant) will also do the trick. Stop in at your local jobber and ask. NAPA, UAP, or whomever you've got in your part of the world.
Or, match the load in the rear.
This is what happened with mine: Once LED went up front, front worked fine. Connected rear stock and rear worked, but front did nothing. Chased it up and down like crazy and got nowhere. Then I changed rear to LED and now both work like a charm. Did not change the flasher.
try it and see if this works for you by taking one of the fronts and hooking it up rear on the same side.