key on no power at all
Check for blown fuses.
Also double check the battery connections old connections sometimes don't tighten all the way down and need to be replaced.
Verify power at every point from the battery to the starter relay. If all points verify 12 volts, then replace your ignition switch. ALL PRE 1990 LINCOLN MARK VIIS SHOULD HAVE THEIR FACTORY IGNITION SWITCHES REPLACED http://www.thelincolnmarkviiclub.org/documents/tech/1984ignitionSwitch.pdf
Thanks very much oldschool that's what I was thinking myself.
Looking for a Used Mark VII in your area?
CarGurus has 16 nationwide Mark VII listings and the tools to find you a great deal.
Search Lincoln Mark VII Questions
Lincoln Mark VII Experts
Related Models For Sale