  We consider the perihelion precession and bending of light in a class of
Kaluza-Klein models and show that the "electric redshift" model, proposed in
Zhang (2006) to explain the redshift of Quasars, does not agree with
observations. As Zhang's model only considers the Jordan frame, we also compute
the perihelion precession as seen in the Einstein frame and show that, to
lowest order, the perihelion precession can only be consistent with observation
in the Einstein frame. However, when we consider the corresponding "electric
redshift" in the Einstein frame, we find that the redshift is significantly
lower than for the Jordan frame and is therefore very unlikely to explain the
redshift of quasars.
