So my car is currently under construction with bits and pieces scattered all over the garage (it never ends)! The battery has been relocated to the trunk and is grounded to the body with another ground running back up to where the engine will eventually be. The motor is out while I paint the engine bay and install the K-member. I need to roll down the windows to install new guide bushings and run channel weather stripping. Can I can power the car on with just the body ground? I'm not trying to start it or anything, just need to power it up to roll the windows up and down. I'm leaning towards yes, just wanted a second opinion.