6 volt flasher and LED bulbs

[sunshine]

6 volt pos. Gr. Using incandescent in rear which are OK . Try I’d to use LED bulbs in added on front signal lites on bumper . Original bulbs worked but not bright enough . Is there a flasher that doesn’t require as much risistence to excite it . The LED bulbs did not work at all . This is 39 with new wire harness . 6v alt. Thanks for all info. Sunshine