Starter trouble for 2016 GMC Sierra Truck 1500
We purchased a GMC Sierra 1500 in June 2016, brand new. It is Apr 2020 and the starter has gone out so the service person said. The reason we took the truck in was because the truck would not start. I would jump start it and then within a few hours the battery is dead. We purchased a new battery last year. I do not trust service department.
If the engine started, even with a jump, why would anyone suspect a defective starter? It sounds more like a defective alternator failing to properly charge the battery.