Electric tie?? That's a new one on me. I have an 851 AutoWrap but it ain't electric. The only thing electric is when the bale chamber gets full an alarm goes off so you can stop and back up while it's tying.
It's for sale, by the way. Just bought a new BR780 last year and the 851 is just sittin. HeII, there both just sittin, nothing to bale. Make me an offer - on either one.