Timing light will not flash

[68_Step]

Just had a distributer problem that you guys helped me fix (thank you!!), and I grabbed my timing light to set the timing. No flash from the timing light, and I figured my ancient timing light just finally decided to die. Picked up a new Craftsman light and the same thing, no flash... nothing at all. Both are induction lights.

I pulled the number one plug and checked for spark, sparks ok. I checked to make sure that I had the battery leads attached correctly, they were. Also moved the induction pickup up and down the #1 wire.

Any idea why I can not get my timing light to flash?