We determine the localization properties of classic direct electric transmission lines by means of the overlap amplitude. The amplitude is defined as C-i,j(omega) = 2 |(IiIj omega)-I-omega|, where I-i(omega) is the electric current in the ith cell of the transmission line for the state with frequency.. This definition is motivated by the concurrence C-i, j(alpha) = 2 |phi(alpha)(i)phi(alpha)(j)|, which is a quantum correlation measure (pairwise entanglement). We distribute the inductances L-j according to three non-linear models: (a) the slowly varying potential model; (b) the Aubry-Andre model and (c) the Soukoulis-Economou model. The results show that the average of the powers of the overlap amplitude <(C-i, j(omega))(2q)> and its scaling properties may accurately characterize the localization behavior of these non-linear models. Moreover, the overlap amplitude can be used to determine the mobility edge of some non-periodic models.