My 97 C230 recently blew a head gasket and is also been having transmission problems I came across a 97 C280 that was just a salvaged wrecked whoever owned this Vehicles took extraordinary really good care of this car everything from front to back interior all look brand new without hesitation I bought the motor transmission drive shaft the radiator condenser to the electrical fans the brain just finished installing the motor and transmission everything is plugged in and hooked up but when I go to start the car it doesn't crank over it has a few times but it's very weak I charged the battery clean the post check all my connections make sure everything was clean I still have the same issue does anyone have a possible idea of what might be going on