Even though Niels Berkers's insertion of a relay into the circuit
is a change from the original design, electrocution and fire were
probably not in the original intent of the manufacturer.  I think the
hidden solid state relay [SSR] is superior to Peter Phillips's use
of insulation and special safety procedures.  Allowing the original
switch to work a relay and thus to function on a minuscule amount
of current and a lower voltage seems clearly the correct approach.

I have done a similar modification to the headlight switch on my
1992 Dodge D250 pickup truck.  It was always burning out due to
the increased load on the tail-light contacts from the trailers I
invariably haul about.  A relay in the circuit corrects the situation.

Peter Neilson