999 Mercury Marqui- car will completely die then come back to life.

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999 Mercury Marqui- car will completely die then come back to life. If I shake it it sometimes comes back. When I say "completely die" I mean every light, the "key is in the ignition" beep, all lights, it goes 100% dead. If I turn the key no lights come on, no engine light, no sounds, ignition, complete silence and lack of any visual. Headlights won't work, interior lights, turning the key results in silence, locks won't work, nothing. It usually comes back in a minute of 2 and today I shook the car and it came back. If it's the fuseable link could you point out where that might be? Or point me to a diagram source for vehicles? Thanks!!