I'm glad I can help. I know these checks are getting long, but I don't like to condemn an expensive part without all the proper checks. As long as you don't mind these tests, I don't mind helping.
When the ignition is turn on, do the gauges on the dash display function? Does the speed needle come up to 60% speed?
With the joystick unplugged did the dash display still say "NO CAN" ?
The voltage readings seem a little odd to me, I just want to make sure you checked it right.
1. With the joystick unplugged, the dash and travel controller were both still plugged in and powered up, (safety levers down)
2. with the dash display unplugged, the joystick and travel controller were both still plugged in and powered up (safety levers down)
3. With the travel controller unplugged, the joystick and dash display were both still plugged in and powered up (safety levers down)
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New checks,
4. With only the left joystick plugged in. (dash and travel controller unplugged) Turn the key on, safety levers down, and at the 9 pin deutsch connector check power from pin A and C. Then check power from pins A and D.
5. With only the dash display plugged in (travel controller and left joystick unplugged). Turn the key on, safety levers down, and at the 9 pin deutsch connector check power from pin A and C. Then check power from pins A and D.
6. With only the travel controller plugged in (dash display and left joystick unplugged). Turn the key on, safety levers down, and at the 9 pin deutsch connector check power from pin A and C. Then check power from pins A and D.