Check the wires as they pass through at the joint where tiller meets the drive unit, some people call it the knuckle , most of the times you'll find a broken wire there , they could also be broken inside the insulation hidden to the eye so sometimes pulling on them will show the broken one stretch more than one that is not broken.

Thank you, i will have to check that out on monday when i go in. Ive taken the handles apart before to change out a couple things here and there, so I understand what youre talking about. And ill check what the code is, i cant remember what it is at the moment but again thank you for your help.

PS: Take a good look at the handle harness where it passes around the return spring.

Alot depends on the codes. But with any that fail when turning and since they are 7 series, I assume a fair amount of hours. I'm 99% sure your issue is under the handle. When you remove the handle assy, not just the stem, you will find that there are control harness wires that have rubbed through to the frame. The insulation on those wires is very soft. It only takes one little strand to poke through to cause issues. So if it isn't obvious, you'll need to inspect carefully.
Removal is best accomplished by removing the arm angle switch bracket before disconnection wires from switches. 1 harness plug and 3 allen socket bolts and the handle assy lifts off.

Alot depends on the codes. But with any that fail when turning and since they are 7 series, I assume a fair amount of hours. I'm 99% sure your issue is under the handle. When you remove the handle assy, not just the stem, you will find that there are control harness wires that have rubbed through to the frame. The insulation on those wires is very soft. It only takes one little strand to poke through to cause issues. So if it isn't obvious, you'll need to inspect carefully.
Removal is best accomplished by removing the arm angle switch bracket before disconnection wires from switches. 1 harness plug and 3 allen socket bolts and the handle assy lifts off.