Thanks so much Jerry, I now have perfect lights all around. you were so right about having the light leads reversed. Fixing it was a problem though. When you look at a dual filament bulb as used on the early model Healeys you'll find one filament stands above the other. The one on top is for running lights and the one on the bottom is for flashing. Both are used for braking but you can see the lower one flashing even with the brakes on because it becomes intermittent. This is an important discovery for me anyway because I always thought it didn't matter which connector you put the two bulleted wires in, but trust me it does matter.

Hi Johnny,
Both filaments shouldn't be used for the brakes, they are on a separate circuit from each other. The running lights (which are fed from the red wire) should have a constant illumination when switched on. The brake/turn signals should only light the hotter filament when the brake and/or turn signal switches are activated. So if you activate the turn signals with the running lights off, only one filament in the bulb would flash.

BTW, did you miss my second post in this thread?

See the current issue of Healey marque. Norman Nock explains flasher on pages 24 and 25.