my spark plugs were burning black leaned out to a point to where it wouldn't run right then bumped my head and said it needed grounded from the batteries to the motor lots of problems fixed all at one time charging, ing. and fuel ran a #1/0 wire to the motor and grounded everything off the motor . i thought I had a good ground when I welded a bolt to the cage which is grounded to the body and sub frame The aluminum front motor mount to the motor (I thought would be enough (not) lessons learned