Yamaha ydre wont't run

[ojo]

Hi all,

got a new project, 2007 yamaha ydre, that won't run. cart came without charger, so first loaded batteries separately, pack voltage ~50v. On a first check, i detected the following symthoms:
When switch to on, no click from solenoid
Switching run/tow, no cllck from solenoid
Pushing the cart forth/back, no motorbrake, no click
Only when pushing the gas pedal, it clicks, and when pedal is off, clicks again.

I'm not new to carts, but new to Yamaha and the ydre was so cheap, that i couldn't walk away

Any suggestions, from where to start?
Rgds ojo