  The deuteron form factors are calculated using two model wave functions
obtained from the 2007 CST high precision fits to $np$ scattering data.
Included in the calculation are a new class of isoscalar $np$ interaction
currents which are automatically generated by the nuclear force model used in
these fits. If the nuclear model WJC2 is used, a precision fit ($\chi^2$/datum
$\eqsim1$) to the Sick Global Analysis (GA) of all $ed$ elastic scattering data
can be obtained by adjusting the unknown off-shell nucleon form factors
$F_3(Q^2)$ (discussed before) and $F_4(Q^2)$ (introduced in this paper), and
predicting the high $Q^2$ behavior of the neutron charge form factor
$G_{En}(Q^2)$ well beyond the region where it has been measured directly.
Relativistic corrections, isoscalar interaction currents, and off-shell effects
are defined, discussed, and their size displayed. A rationale for extending
$ed$ elastic scattering measurements to higher $Q^2$ is presented.
