May be the starter, May also be a bad battery.. Starter isnt too hard to replace.. Havent done one my self yet, but i read about it in ma Haynes book :-)
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1999 ram sport 4x4
single cab
V8 5.9
Go to auto dealer or any major parts store , they will check it for free and let you know whats wrong . then see how much they want for a rebuilt one , you can do it if you have any mechanical skill , remimber to disconect the battery first so you dont short out the system.