My daughter smoked her 2011 malibu 2.4 ecotec engine by not changing the oil often enough. I bought a 40,000 mi. engine of the correct codes from a salvage yard and installed it in her car. When I try to start it all that happens is the starter drive will engage the flywheel but the starter motor will not rotate. The battery shows 14 volts. The engine is free and rotates. All grounds have been properly cleaned and reattached. I thought the starter was bad so I bought a replacement. Same results. I have checked the fuses in all 3 locations and they are good. Tomorrow I will check the starter wiring system and the TR switch. ( neutral safety switch ) Any suggestions of possible solutions are welcome. Thanks in advance.