  We identify experimental signatures in the current-voltage (I-V)
characteristics of weakly contacted molecules directly arising from excitations
in their many electron spectrum. The current is calculated using a
multielectron master equation in the Fock space of an exact diagonalized model
many-body Hamiltonian for a prototypical molecule. Using this approach, we
explain several nontrivial features in frequently observed I-Vs in terms of a
rich spectrum of excitations that may be hard to describe adequately with
standard one-electron self-consistent field (SCF) theories.
