To find the second term of the geometric sequence defined by the recursive formula \( a_1 = 4 \) and \( a_n = 3a_{n-1} - 7 \), we will calculate \( a_2 \).
Using the recursive formula for \( n = 2 \):
\[ a_2 = 3a_1 - 7 \]
We know \( a_1 = 4 \):
\[ a_2 = 3(4) - 7 \]
Calculating that:
\[ a_2 = 12 - 7 = 5 \]
Therefore, the second term of the sequence is
\[ \boxed{5} \]