I have an 08 2500 6. 7L that did not want to start the other afternoon all it would do is make a clicking noise that sounds like a relay clicking thought maybe the starter or batteries? Was able to get it started after trying to jump start it. Drove it for about 30 min shut off and was able to restart it right away. I took the batteries out and had them load tested and tested good. After the truck has set for 3 days truck is still able to start right up. Is this a starter issues or something else?