In d&d 3.5 edition, what is the effect of a Paladin’s Aura of Good?
In dungeons and dragons 3.5 edition, what is the effect of a Paladin’s Aura of Good?
It just says “Aura of Good (Ex): The power of a paladin’s aura of good (see the detect good spell) is equal to her paladin level.”
And detect good spell says “it detects the auras of good creatures, clerics or paladins of good deities, good spells, and good magic items, and you are vulnerable to an overwhelming good aura if you are evil. Healing potions, antidotes, and similar beneficial items are not good.”

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That’s it. The Aura of Good doesn’t give the Paladin any benefits or special abilities, it just means that they will be detected by a detect good spell. (This can be a drawback, as an evil caster could detect your presence using this spell, and given a couple of rounds could estimate how powerful you are by the auras power.) Detect Evil and Detect Good are on p. 218-219 in the Players Handbook, and provide more information about detecting such auras.
Nothing other than allowing things that detect alignments to find you wherever you may hide.