I deaperately need a help with my 500 SEL (1985). The engine died and can not be started. There is no spark when you crank engine . I found that there is no power on fuel pump. Its positive wire is grounded somewhere (no resistance to the ground). Fuel pump relay clicks when you connect battery terminals with ignition key out (I found it by accident ). When I turn ignition key, fuel pump does not run, so engine does not start. Fuel pump runs when I connect it directly to the power. My guess that it must be a short fuse somewhere in an ignition lock. But I can not remove it or test it ! What are steps to do this for this car?