  The dependence of fusion dynamics on neutron excess for light nuclei is
extracted. This is accomplished by comparing the average fusion cross-section
at energies just above the fusion barrier for $^{12-15}$C + $^{12}$C with
measurements of the interaction cross-section from high evergy collisions. The
experimental results indicate that the fusion cross-section associated with
dynamics increases with increasing neutron excess. Calculations with a
time-dependent Hartree-Fock model fail to describe the observed trend.
