6 volt generator HELP

Hello fellow HAMBers. I know many of have done this just help hooking up generator. I connected Arm and Field already to voltage regulator just wanted know where to connect the the ground from generator. I am running positive ground. Any help will be appreciated.

 

just attach the ground to one of the regulator mounting screws/bolts

 

My ground runs to the firewall and is attached to one of the screws that mount the regulator.

 

That's what I did I just wanted to make sure. Thanks for all the help HAMBers!