I think its the alternator. I was answering another post about someones system that would not turn on because their car does not put out 12 volts. I was explaining that I had to lower mine to 11.5 inorder to get my Car PC setup to activate, and even then I had to put my engine into high revs the first time I try to get it to turn on, otherwise I get a low voltage error. The battery is fairly new, bought it in 2008, so that leaves the alternator. With me driving a truck the ALT should put out at least 14V and the fact that I have to do so much, means it isnt putting that out anymore. We will not really know until I get a volt meter and test. I cant believe I forgot about that issue.