Vintage EZGO Sunbird

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Rebuilding an EZGO Sunbird. So far i'm not able to get power to the wheels and have a few questions. Facts: It is completely stock with (6) new 6v batteries. I'm using the same wire routing as the old owner. So far, I have only been able to get a clicking noise from the solenoid. I tried jumping posts, but still only clicking. In replacing the solenoid, I noticed the old one was intermittent and the new (used) one is consistent. Bought an old Melex to use for parts.

Questions:
1) anyone know where I can find a wiring diagram?
2) do these carts need a ground?
Assuming I just tie the batteries into series, including motor, solenoid, accelerator board and F/R switch, correct? (I mean, it's not rocket science...)
3) anything I can do to test the motor before I replace? It looks very old and have never seen it move.
4) do I need int or con solenoid?

Thx Much!