Check out Automobile Alternator 3D model on CGTrader for $34. High-quality Polygon mesh mesh by 3D-Horse: 119512 polys, 119512 vertices.
OBJ (OBJ, filesize: 6.7 MB), MA (Autodesk Maya, filesize: 7.26 MB), C4D (Cinema 4D, filesize: 1.21 MB), MAX (Autodesk 3ds Max, filesize: 8.34 MB), LWO (Lightwave, filesize: 1.54 MB), HRC (Autodesk Softimage, filesize: 4.9 MB), 3DS (3D Studio, filesize: 1.24 MB)