My wifes town & country has a problem with all her lights pulsating.

What is your question?

All lights on the exterior and interior pulsate or flicker about 2 ~ 3 times per second for long periods. sometimes they dont do this until you use a turn signal or another item like heater fan. However, doesn't seem to affect the battery and there is no warning or charging light coming on. Do not know if this is an alternator problem, idler pulley or a short. Don't know exactly where to start without taking it to a dealer for the usual runaround.