I am getting gas when...

[Broken_down?]

I goto start the truck and the starter sounds liek it is grinding. But not turning the engine over. after a sec of grinding noise the starter just spins. what is going on here? My truck sits at the gas station right now till tomorrow. Anyone think it could be a loose starter cable? or is the some***** just dead? when I 1st got the truck when the engine was ran for awhile the starter would like seize in middle of cranking. We found that the starter placment was so close to exhaust manufolds etc.. it was getting so hot that the silinoide would stop working. So we added a second one on the firewall to help the one down on the starter. That fixed it. Now it is just grinding and will not even turn the truck over to try to start. any ideas whats going on?

Please I have to get my truck out tomorrow after noon. And my broke ass cannot afford a dam tow truck.