New Holland BR7060 electrical problems

My husband bought a used nhbr7060 with almost 15,000 bales through it. It started doing odd things a few weeks ago while in operation, first it was wrapping the twine all throughout the bale, then not cutting the twine from bale to bale (was not happy to have to run 4 miles up the street curting twine out of trees from one field to another) then it stopped extending and retracting thr net wrap. So...over a thousand dollars in parts and service charges later, still no progress. We bought a new computer for it, new bale command monitor and had to put a new alternator in the tractor, it powered up once, beeped and died, now it won't even power up. We have been through the entire wiring harness, found where it has power and ground, fixed the tractor voltage issue so now have isolated it to the bailer but we've hit a brick wall. The dealer who has been out to look at it twice (moron didn't even bring tools with him) he has no idea, and just wants to throw parts at it. I fear that even if I spend another 700 plus dollars on a harness, it still won't fix the computer problem. Anyone out there experience a similar issue? Can anyone please tell me where to find a good wiring harness diagram (one showing what each wire does)? The one from the manual does not show this. Any help would be greatly appreciated. I am about ready to leave it out front for the repo men as I fear it's not worth the investment/aggervation. Thank you in advance.

New Holland BR7060 electrical problems