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We provide an ultraviolet (UV) complete model for the $R(D^{(*)})$ anomalies,in which the additional contribution to semi-tauonic $b \to c$ transitionsarises from decay to a right-handed sterile neutrino via exchange of aTeV-scale $SU(2)_L$ singlet $W'$. The model is based on an extension of theStandard Model (SM) hypercharge group, $U(1)_Y$, to the $SU(2)_V\times U(1)'$gauge group, containing several pairs of heavy vector-like fermions. We presenta comprehensive phenomenological survey of the model, ranging from thelow-energy flavor physics, direct searches at the LHC, to neutrino physics andcosmology. We show that, while the $W'$ and $Z'$-induced constraints areimportant, it is possible to find parameter space naturally consistent with allthe available data. The sterile neutrino sector also offers rich phenomenology,including possibilities for measurable dark radiation, gamma ray signals, anddisplaced decays at colliders.

$R(D^{(*)})$ from $W'$ and right-handed neutrinos