Nocluelexu

First of all thank you for anyone who can help me . Someone changed my alternator and by doing so they pulled out my crankshaft sensor out of the connector he tried to put it back but it didn't work. Long story short I sent him home. I got new connector from the junkyard I splice them but I don't know if it matters what wire goes to what. But my car doesn't start nor does it get signal from the ecu . Would anyone help me .