mercury grand marquis 2003October 9, 2015October 11, 2015Ignition switch replaced and car will not start. Is there any possible steps maybe left out that we missed? Keywords:Grand Marquis 1 thought on “mercury grand marquis 2003” Freeautomechanic October 11, 2015 at 12:36 pm Why was the ignition switch replaced to begin with? What happens when you try to start it? 1) Nothing… no dash lights, no head lights, not clicking, nothing? 2) dash lights and nothing else happens? 3) continuous clicking (click, click, click)? 4) one hard click? 5) just continues to crank but does not start? Comments are closed.