The nuclear-magnetic-resonance (NMR) and susceptibility behavior of the intermetallic compound AuGa2 differs anomalously from the isoelectric and isostructural compounds Auln& and AuAlq. In an effort to test and extend the explanation offered by Jaccarino et al. and by Switendick and Narath, spin-lattice relaxation times and Knight shifts have been measured as a function of temperature and composition for the AuAlp-AuGa2, AuA12-AuIn2, and AuGa2-AuIn2 pseudobinary alloy systems. At high temperature, the solute X (Al, In, Ga) resonance properties are dominated by the host. Satellite resonances are observed with temperature dependences differing from the main resonance. The results are partially explainable on the basis of an average-band model and partially on a local atom model. The role of the Au d bands is discussed. Metallurgical results on alloying are obtained using the NMR data.