  We propose a gauged $U(1)_{B-L}$ extension of the standard model (SM) to
explain simultaneously the light neutrino masses and dark matter (DM). The
generation of neutrino masses occurs through a variant of type-II seesaw
mechanism in which one of the scalar triplets lies at the TeV scale yet have a
large dilepton coupling, which paves a path for probing this model at
colliders. The gauging of $U(1)_{B-L}$ symmetry in a type-II seesaw framework
introduces $B-L$ anomalies. Therefore we invoke three right handed neutrinos
$\nu_{R_{i}}$(i=1,2,3) with $B-L$ charges -4,-4,+5 to cancel the anomalies. We
further show that the lightest one among the three right handed neutrinos can
be a viable DM candidate. The stability of DM can be owed to a remnant $Z_2$
symmetry under which the right handed neutrinos are odd while all other
particles are even. We then discuss the constraints on the model parameters
from observed DM abundance and the search at direct detection experiments.
