2007 Chevy Suburban Heated wiper washer fluid system

Dear 2Carpros,

I ´ve a Chevy Suburban from year 2007. I read about a problem with the heated wiper fluid system and it may overheat the control-circuit ground wire.
My questions are, where can I found the ground wire under the hood? Does it go from the underhood fuse block or?
My last question is, how many litres can you fill upp the windshield washer fluid resevoir? Yes, I know I can check by my self and fill it when it ´s empty, but the problem is that my engine has been on fire. I hope I spell I right (my swedish is better).

Best regards,

Jan Berntsson
Sweden