  We study the voltage drop along three-terminal disordered wires in all
transport regimes, from the ballistic to the localized regime. This is
performed by measuring the voltage drop on one side of a one-dimensional
disordered wire in a three-terminal set-up as a function of disorder. Two
models of disorder in the wire are considered: (i) the one-dimensional Anderson
model with diagonal disorder and (ii) finite-width bulk-disordered waveguides.
Based on the known $\beta$-dependence of the voltage drop distribution of the
three-terminal chaotic case, being $\beta$ the Dyson symmetry index ($\beta=1$,
2, and 4 for orthogonal, unitary, and symplectic symmetries, respectively), the
analysis is extended to a continuous parameter $\beta>0$ and use the
corresponding expression as a phenomenological one to reach the disordered
phase. We show that our proposal encompasses all the transport regimes with
$\beta$ depending linearly on the disorder strength.
