Bobcat 753C Non-Cranking issue

I have a Older 753C and the Starter will not crank. Here is what I have checked. The Ignition switch has been replaced. The battery is good and the cables have been checked and cleaned. I have switch the Starter relay with the Glow. All of the fuses have been check in the fuse box. You can turn on the Ignition switch to run and the Display panel shows fuel, battery, and the Glow plug working. You can go to the back of the engine and jump power from the battery directly to the starter solenoil and it will start and run. Can anyone think what might be the problem other than a broken wire in the starting circuit. Thanks Don

Based off what you said, you have the BOSS system which is a miserable pain in the ass if it screws up. That said, I'm going with a broken wire. Flip the cab and look over the cab harness coming down to the main frame. Common place for wire problems. I don't think the starter circuit is protected by a fuse, but I would still check those first.