I have a 2008 titan pro-4x with 212970 miles. went to the store the other day to get some stuff for an oil change, I started up just fine, ran perfect, got to the store and went in for like 10 min, came out and truck wouldnt start. no cranking or anything. when I try to start it, its just a single click noise from the starter solenoid. I've since replace the starter, battery, terminals, replaced my starter relay, ignition relay, and ecm relay. ignition works fine, all my lights come on, stereo, blinkers and reverse, windows and power seats. battery is at 12.6v. I've missed 3 days of work so far and would rather not miss anymore.. any help would be appreciated.