If your system is something else, you must make this conversion before continuing with an alternator upgrade. First, you need to remove the previous charging system (generator or alternator, including the associated voltage regulator.)
http://www.yesterdaystractors.com/articles/artint178.htm
I used a Datsun alternator for my Massey Ferguson because the diameter was the same as the original generator. Before you begin you need to make sure your system is a 12v, negative ground charging system. If your battery is 12v and the negative (-) post is connected to the chassis or engine block, your system is 12v negative ground.
http://www.yesterdaystractors.com/articles/artint178.htm
A charging system voltage drop check can help you locate the source of an under-charge or over-charge condition due to problems in the wiring or connections between the battery and alternator. 1. Start the engine and let it idle.
https://axleaddict.com/auto-repair/Alternator-Problems-Troubleshooting
Noise can be a sign of alternator problems when it comes from the charging system. The next check points will help you isolate the source of the noise. Check the drive belt or serpentine belt.
https://axleaddict.com/auto-repair/Alternator-Problems-Troubleshooting
What is a charging system. The Alternator. The Voltage Regulator. Charging system gauge or warning lamp. What Can Go Wrong. Repairing Charging System Problems. What is a Charging System? The modern charging system hasn't changed much in over 40 years.
https://www.carparts.com/classroom/charging.htm
A voltage regulator is designed to limit the voltage output of an alternator to 14.5 volts or less to protect the vehicle's electrical system. If the regulator malfunctions and allows uncontrolled voltage to be released, you will see bulbs and other electrical components begin to fail.
https://www.carparts.com/classroom/charging.htm
.The main component in the charging system is the ALTERNATOR. The alternator is a generator that produces Alternating Current (AC), similar to the electrical current in your home. This current is immediately converted to Direct Current (DC) inside the alternator. This is because all modern automobiles have a 12 volt, DC electrical system.
https://www.carparts.com/classroom/charging.htm
This is a very simple description but it will work for our needs. Modern alternators offer improvement to an older tractor's charging system and cost far less. This article addresses the electrical adaptation of a modern alternator to an older tractor. I reference the Delco alternator used in most GM late 70’s cars and trucks with a 350 cu. in. V8 engine.
http://www.yesterdaystractors.com/articles/artint178.htm
The main regulated power lug is typically wired to the ammeter. 1  Connect to the plus side (+) which will be the terminal NOT connected to the positive post of the battery. If you don’t have an ammeter, connect the power lug to the starter, where the big wire from the battery connects.
http://www.yesterdaystractors.com/articles/artint178.htm
If this warning lamp lights up while the engine is running, it means that there is a problem in the charging system, usually an alternator that has stopped working. The most common cause is a broken alternator drive belt. The alternator is driven by a belt that is powered by the rotation of the engine.
https://www.carparts.com/classroom/charging.htm
alternator system
In the charging system, the alternator is a generator that produces Alternating Current (AC), similar to the electrical current in your home. The alternator system is a generator that produces Alternating Current or AC, similar to the electrical current in your home.