problem please respond

[nissans13240sx]

ok, i posted last week about how i accidently shorted my alternator out. well today i fixed that turns out the 75amp fuseable link was bad. when i replaced it the car started right up. i let it run for awhile to make sure the alternator was good. It checked out ok. So about an hour later i took it out for a good drive about 30 miles, on the way i hit a few bumps and lost power for a split second(radio turned off tach droppped) it came back on almost right after. So i got to my girlfriends work turned the car off went inside for a few minutes. when i came out i turned the key and i had no power again. the headlights worked, but nothing else worked no idiot lights no seat belts. so i pop the hood and fool around with the battery ground on the intake manifold and after about 10 minutes of trying this it starts. i got home parked in the garage and now it wont start again. I tightened the loose battery ground but no differnce. So i need some help are there more grounds? what else could i have messed up when i shorted the alternator? please help

[nissans13240sx]

forget it your to slow i already fixed it . it was the ignition switch one of the wires was loose. how that happened i dont no.

[S13FASTBACKSR]

i bet your ignition switch is loose