Description: Silverado, sierra. Avalanche, Escalade EXT. 145 amp. Escalade ESV. 145 amp. Canyon, Colorado. 4.3L, 2003-14, 145 amp. 5.3L. Newly manufactured as an exact replacement for your GM vehicle's original alternator This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors