DC - DC ATX current drain?
I've had my carputer installed for 2 weeks now, and when I woke up this morning I couldn't start my car because the battery was drained. Now I'm sure that the computer was turned off, but my USB GPS was still powered by the computer, and the Liliput was completely powered off although it was connected to the USB port too.
My question is, although the computer is switched off the power supply is still powering my GPS receiver and there is still power to the motherboard so how much current is this draining?
My DC - DC power supply is a 250w ATX, and has three connections; 12v +, Ground, and ground on/off. I've already got a start button to turn my computer on, so the power supply is on all the time but I'm now thinking it would be better to have power to the power supply only when my ignition is on?
Anyone have any similar problems or thoughts?