It has come to my attention that many of you are wondering if/when one should light a Yahrzeit candle on Passover. The short answer - Yes!
Yahrzeit candles are also supposed to be lit whenever a Yiskor (remembrance) service is said in synagogue. This would be, Yom Kippur, and the last day of the three pilgrimage holidays: Shemini Atzeret (the 8th day of Sukkot), Passover, and Shavuot.
Remember my quizative ones, Jewish 'days' begin at sundown of the previous day (according to our secular-everyday- calendar). So, for Pesach you will light the Yahrzeit candle at sundown the evening before the final day of Passover. If you are Reform or live in Israel and celebrate the holiday for 7 days, this will be after sundown on April 20th 2014. If you are Orthodox or Conservative and observe Pesach for 8 days, you will light your candle(s) on the evening of April 21st 2014.
Now don't fret if you forget the evening before. It is still permissible (among all streams of Judaism) to light the candle the following day if you have forgotten.
Here is a link to find the candle lighting times in your area. There is even a mobile app if your phone is smarter than you are!
If you have more questions, please feel free to leave me a comment and I'll be glad to respond!
May you have fond memories of sharing Pesach with your departed loved ones.