Lets assume we are talking about the Delco 10si alternator.
First thing I am going to question is 'true One wire alternator' Them thing are expensive. Many are marketed as true One wire alternator but are not. They work OK on a gas car engine with higher RPM's but with a 1500 rpm tractor you need to rev them way up at start up to get the alternator charging. You can wire it as a one wire now and if not happy convert it to a 3 wire later. Or if you want the dash idiot light to work wire it as a 3 wire setup now.
Any wiring from the generator and voltage regulator can be removed. You need none of it.
On the back of the alternator there is a 'B' post. 10 gauge wire gets hooked here and run to the battery positive. Most hook it where ever the battery cable hooks such as starter solenoid.
Your dash light should have two wires on it. As you said one of the wires goes to the key switch. If you want to wire it as a three wire the other wire on the light goes to the #1 plug post on the alternator. The #2 plug post on the alternator gets jumped back to the B post on back of alternator. You can buy the wire end plug for this alternator at any parts store.
I will include a wiring diagram for a Ford tractor but it should be the same with minor differences. It should at least give you a picture to try and follow along as you read. If you want to convert over to an amp or volt gauge let me know as I have diagrams that show those.
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