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Quasi ternary filled skutterudites Pry(Fe,Co,Ni)4(Sb,Sn)12 were investigated by means of temperature dependent magnetization -, specific heat -, electrical resistivity - and thermopower measurements. As non-Kramers ion in cubic environment Pr can exist in both a magnetic or a nonmagnetic ground state and crystal field effects strongly influence physical properties in an extended temperature range. Detailed investigations of Pr0.73Fe4Sb12 point to antiferromagnetic order and Γ5 as crystal field ground state. Strong electron correlations give rise to significantly enhanced masses of charge carriers, which in turn enhances the Seebeck coefficient S(T). Owing to the Fe/Ni substitution, large values of S(T) are found reaching figures of about 230 μV/K at 425 K for Pr0.21Fe2.5Ni1.5Sb12 in combination with low thermal conductivity as expected for this class of materials. Moreover, the Fe/Ni substitution drives the system from hole- to electron-dominated transport, which is obvious considering the crossover of S(T) from positive to negative thermopower values in Pr0.1Fe2Ni2Sb12.