True confesssions, I snuck out the kids' Radio Shack basic electronics kit (untouched from Christmas) MAWA HAW HAW HAW Yeah, I'm still thinking about the turn signals:

Stuff that failed:
*Yellow 12V beehives draw too much power (for my 18V drill battery) Housing is perfect tho!
* On a 6LED Vista light, unable bypass the rubber power button to an external switch. Radio Shack said it can't be done. (I'll bet a guru can figure that out!)
* On the Vista, unable to disable all of the other blinking modes to run JUST simple ON-blinking and OFF.

The simple LED flasher on a bread board, works great. If the only way to get an simple BIG turn signal is to run it off AA, I may sacrifice the Vistas battery housing.