I know it can be very frustrating when guys throw all these ways of doing something at you. Especially when they know how each piece works and you are really lost in the dark.
On the other hand it is very hard to talk electricity over the internet because there are so many ways to wire this tractor. If you can not understand the wiring looking at it just think how we feel never seeing the tractor.So lets break it down piece by piece. The coil has nothing to do with the starting system so we will leave it alone for now. You did say the system is working correctly. In the starting system there is the Key switch; Starter solenoid; the push button switch; and the starter. You said your key switch is on off so that is original and will work.
You need to check your starter push button on the trans with a OHM meter and see if it is still working.
And we all know the starter works well so that is good.
The part that really needs a look at is the Starter Relay or solenoid. Since you are using a dash button I know from past experience you most likely have the wrong relay. You are using what we call a car relay or the one used on 1965 and later tractors and you need a grounding or what we call a older tractor relay for the 600 or 601. How a starter relay works So you need to buy the correct relay. While you can get them from Napa any other auto parts store will most likely try to sell you the wrong part. You are looking for a grounding relay. It can be 3 post or 4 post. Does not matter; you just wire it different. If you are still unclear on his ask away; or we can give you links to where you can buy the correct part online. For more info you can look at the following links. When looking at these any info I give on a 600 can also be used on the NAA. That piece you asked about with all the wires is a terminal block. It is just a insulated bolt where you can join wires together. Each bolt is insulated from each other. The poor man way of thinking would be all the wires you see on one bolt twisted together with black tape on it.
After reading all this you can now come back and ask questions. The best part is you will now understand what we are saying well enough to follow along.
If in the future you want to tackle the rest of the wiring and the coil we can then do that. Ford Hundred Series 12V Conversion
Wiring diagrams Sure hope this helps you out
John
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