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I doubt the strobes are the culprit. What do you have in the way of electrical system instrumentation? Can you look at the current output of each alternator? If so, watch the current draw on one or the other, see if it is changing in synch with your pulsations. Also, turn off other electrical equipment, see if that is causing it. What year model airplane do you have? If '73 or newer, it is barely possible that your hydraulic power pack is cycling that fast, but again, unlikely. Only way to check is to pull the circuit breaker.
Others on the board know more about this stuff than me, I am sure you will get some good suggestions. The fact that it is cycling regularly (if I read your message correctly) means to me that something is turning off and on to cause this. If it is flickering irregularly, that is a whole different animal, probably a loose connection somewhere, or a power supply going bad...big fun to find.
My two cents, others will have better advice to offer...
Kevin
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