My 99 Cummins will not start :(
 

Okay so Saturday I drove my truck about an hour pulling my buddies truck to sale it, we went back to his house and when I went outside to leave, my truck was barely cranking over.. I thought my batteries were shot so I had him jump me. It took forever but finally started, it didn't seem like the jump helped I just got lucky. So Monday I go to work its starting perfect like usual and after work I go home shut my truck off and it hasn't started since then. It would turn over real slow, not enough to even start the truck. Now it won't turn over at all, I'm stuck on what to do. I had my batteries tested my alternator and starter they all are good. I thought loose connections so I replaced my battery terminals and cleaned the battery posts and still nothing. Any help would be greatly appreciated, thanks. Also there are not codes shown, the check engine light is off.

Voltage drop from b+ to starter b + , sounds like a bad starter. How did you test it?

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It is my starter I took it to o reillys and had it tested they said its good well we took it apart and its garbage so I'll be replacing my starter