How many times does a ger tovel (immerse) when converting? I know that a ger immerses first then makes the bracha (can't make the bracha yet until the person becomes a Jew). Does the ger then immerse again after this a second time? If so why/what is the source for this?
See Shulchan Aruch Horav Hilchos Yom Kippur 606,12 (in the name of the Maharil-Mogein Avrohom) that the reason for Tevilah on Erev Yom Kippur is for Teshuvah like a Ger and therefore one needs to dip 3 times like a Ger does.
A convert actually immerses three times, according to Rabbi Maurice Lamm here:
There is one exception to this general practice of placing the blessing before the mitzvah--the immersion of a convert. The convert needs to recite the blessing after the immersion, not before. The reason is simple: One cannot declare "God commanded us" if one is not commanded by God because he or she is not Jewish. The convert becomes a Jew only after the immersion is completed.
After the blessing, the convert immerses twice more and then leaves the mikveh.
A second blessing is required by most, but not all, authorities. It is called she'hecheyanu, and with it a person thanks God that He has enabled him to live to experience the greatness of this moment.
I don't know his sources, but I know that this is the practice in my local community.
I converted to Judaism on Sept 5, 2012 (Conservative). We did three immersions as described in the above post. All my studies say the same thing. This was in Chicago. Hope this helps.