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We analyze the sensitivity of low-energy fundamental symmetry tests tointeractions mediated by doubly-charged scalars that arise in type-II seesawmodels of neutrino mass and their left-right symmetric extensions. We focus onthe next generation measurement of the parity-violating asymmetry in M{\o}llerscattering planned by the MOLLER collaboration at Jefferson Laboratory. Wecompare the MOLLER sensitivity to that of searches for charged lepton flavorviolation (CLFV) and neutrinoless double beta-decay ($0\nu\beta\beta$-decay) aswell as present and possible future high-energy collider probes. We show thatfor the simplest type-II seesaw scenario, CLFV searches have the greatestsensitivity. However, in a left-right symmetric extension where the scale ofparity-breaking is decoupled from the $SU(2)_R$-breaking scale, the MOLLERexperiment will provide a unique probe of scalar triplet interactions in theright-handed sector for a doubly-charged scalar mass up to $\sim$ 10 TeV andhelp elucidate the mechanism of $0\nu\beta\beta$-decay.

Doubly-Charged Scalars in the Type-II Seesaw Mechanism: Fundamental Symmetry Tests and High-Energy Searches