Jim is correct that site has the wiring diagram in pdf format for free. 684 belongs to 54-74-84 Series tractors.
Direct link: http://cngco.com/wiring_diagrams/IH%2054-74-84%20SERIES.pdf
You are correct Operator Manual has a wiring diagram that is worthless. Maybe makes sense to UK trained Electrical Engineer!!! The best diagram was in our 454 Operator's Manual, my Dad loaned it to a neighbour who had a 574 and he died suddenly and family had an auction sale and manual was gone!!
Most wiring problems are caused by a bad ground or the molex plug that is under the rear seat. There is one ground by from of rad that is used for head lights and another ground at back of seat on a bolt that holds the deck plate on. Sometimes wiring harness gets frayed under the sheet metal cover over the transmission or under the deck plate that the seat sits on. Fuses rarely blow.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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