new weird problem

[240walker]

i pulled my engine out. it was running fine before i pulled it out except for this crazy rattling noise. the rattling noise come out to be the flywheel backing off of the crankshaft. well anyway the engine was out and i went back and rechecked the head, etc. all is good on this side. i put the engine back in and i labelled everything so it is all supposedly hooked up just the way i took it out, except for the fact that it will not fire up by the ignition switch. i can put a trigger on the starter and turn my switch on and hit the trigger and the car will fire up quick (won't idle cause my dist. is off one tooth) and i can throttle it to keep it running. i can leave the trigger on the starter (little green wire and the battery wire) and use the ignition switch and the car will fire up. i can pull off the trigger and the car continues to run like normal. but when i take the trigger off and try to crank it by the ignition itself it will not fire up. what could be the problem? could it be a fuse? i'm begining to think that turboing the car wasn't such a great idea. problem after problem. please...any advice is GREATLY appreciated.......

[driftingmy240sx]

may be the starter relay or immobilizer relay