I bought my front-main harness from avspare.com and rear-main from messicks.com. Both are made by CNH, but I didn't see any way to order from them directly. Avspare is in Latvia, good prices, but check with Igor first (the man who owns the company) to make sure he has what you need in stock. If you order from him, wise.com seems best for the money transfer.
The New Holland Service Repair Manual(#87032904) turned out to be essential, and has wiring diagrams. I found a .pdf version for sale on-line for approx $40. First locate the document number, then Google (shop manual OR repair manual) AND new holland AND 6610S or whatever your mfr and model number are, obviously. Keep in mind that the repair manual and the shop manual aren't the same thing. I got my repair manual from therepairmanual.com
THe biggest hassle in this mess, apart from the sheer expense, was the complexity. None of these harnesses had any part or connector labeled. I spent probably 50 hours tracing circuits with my VOM, and painstakingly labelling each one with bits of masking tape saying what each thing was.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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