2010 YDRE3, No history, won't run, trouble shooting

[JPonLKN]

Ok, first of all, I am a Gas EZGO guy, with no experience with Yamaha or Sparky carts, so bear with me.
A friend of mine has a 2010 YDRE3, 4 x 12v set up, and it quit working. Very stock machine, still at work on a golf course. They did some work on it to try and figure it out...but I don't know exactly what, as he didn't do the work, and can't elaborate. I have the cart now, and offered to trouble shoot and figure out where they went wrong and what it needs, then try and get it running again.

First, the batteries are a tad low. I get 45.5 volts to the solenoid. All the terminals from the controller to the motor appear to be hooked up correctly, at least the A1 to A1, A2 to A2, F1 to F1, and F2 to F2 all appear to be connected properly. With the key off, using a volt meter and ground probe on the negative battery terminal at the end of the set, I get battery voltage to all 4 of the solenoid terminals. Clearly, there is an issue with the solenoid. The fact that it is getting voltage across the terminals with the key off, makes me believe there is an electrical draw, and maybe a wiring issue somewhere else, so I am not surprised the batteries are a bit low. Each measures High 10s to low 11 volts. I didn't bring a charger with me, he had just charged the batteries, so didn't expect I would need it. Oops. I will bet it next weekend when I see him again.

I don't have a manual for it, so I don't know any of the diagnostics to verify controller, motor, or even verify if the wiring is correct. I would not be surprised if there are wiring issues. They reportedly replaced the harness between the motor and controller. Not sure why it was needed.

Anyone have any thoughts on where to start in verifying electrical parts? How about a manual for it? How low of a battery bank charge can I go and still have it operate? I would think it should operate at below 48Volts, just not at full speed. Thoughts?

What voltage should I be getting to the small terminal on the solenoid?

Any help is appreciated.
Thanks