My son recently got a 2005 dodge diesel and it was running fine, then to day after he drove it for a while, parked it and then tried to start it. He said it tried for a second, then quit. All the lights, bells and whistles work when switches key on. When moved to starter position, nothing. Starter does not engage. Only thing I can see is the little relay in fuse box does engage in and out. Im not a great mechanic, so if you guys have had any experience with this, any help would be appreciated. Thanks