Okay guys here's a question. I don't post much but when I do it's usually something stupid because I've done something stupid and this is no different so I needed to put a new head gasket on my 2009 Mazda3 2.0 liter. I thought I blew the head gasket, took it to the mechanic he said I had no compression so it looks like you need a new motor so I just took him at his word so I went and got a motor and when I started to take my motor apart to get it out of the car I disconnected the everything but mainly the wiring harnesses not just from the the PCM or ECU but from the motor itself where they just sat on the ground and I didn't label anything...So now I'm at the point where I'm trying to start it and I've got a bad battery drain and it won't stay if it drains while I'm trying to start it with a charger on it, brand new alternator, brand new starter and not a brand new belt...All suggestions would be very appreciated.