This involves a company truck, 08 Chevy Silverado. I am not a mechanic or DIY nor do I play one on TV. The problem I am having is that every 2 or 3 months this truck will not start and completely looses power until it sits for several hours then will crank as if there was not a problem. We replaced the battery after the first time thinking this was the issue and worked fine for about 3 months then the problem occurred again. We tested the new battery (meter test and cell test) which tested like a new battery should. The alternator also showed that it was charging the battery. All of the connections are clean of corrosion and tight. All of the fuses are good. This has been on going for about 10 months now and with the latest episode, we brought it to the local dealership service department. They were able to repeat the problem but unable to determine what is causing the problem.
There are signs that this is about happen such as a couple of days before the truck may hesitate just slightly before cranking. Next sign is as soon as someone turns the key off the radio and lights that usually stay on until you open the door goes off and the truck may not crank on the first try after this incident. This last one usually means that a few cranks later that it will not start and has totally lost power.
The normal culprits for power issues seem to be working properly. Any suggestions on what the problem could be? Could this be a computer or sensor problem?