Still another turn signal question

[flatheadfan]

I have wired an after-market turn signal set up in my '35 and '36. From the dash switch a full 6 volts go to the flasher. Coming out of the flasher is 4 volts. This low voltage causes the turn signal lights to be dim. If I bypass the flasher the bulbs are nice and bright. I realized that the addition of a couple of solenoids in series to the turn signal bulbs would help the situation. But, it seems a simpler solution would be a different type of flasher. I have tried several different 6 volt flashers with the same result. As for wiring, I am using 14 gauge wiring from the switch to the flasher to the bulbs.

I am open to ideas! Thanks.

Tom