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Hello everyone! I have recently changed out my 3.6l engine for another used 3.6l. I have tested the battery, checked all the electrical connections. The starter tested good and the starter relay is good. The issue that I am having is it has a very weak crank if I'm lucky maybe one rotation and then nothing. Is there anything special that has to be done? The only thing that makes me worry is the fact that I changed out the 2008 3.6l with the 2009 3.6l but I researched it thoroughly and it seemed as if it was identical specs! Any kind of help would be greatly appreciated!
 

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Ck battery voltage with dvom meter while cranking,if above 9,5 v ck for votage drop between engine metal part and ground cable,make sure it is not more than 0.5v drop between grounds
 

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Sounds like bad/loose connection on positive or negative side. ...also how did u check the battery? With a battery load tester or just a voltmeter?
 
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