G4200 wiring assistance

[ddg]

Got an older G4200 that I use very occasionally to pull a small trailer. No mowing or anything but just pull the trailer. Over the winter, an electrical short causing all the wiring to melt. I have removed the entire melted mess and am attempting to get it running as simple as possible. I have replaced the gauges with automotive gauges and sender that obtain power from the battery. Got a two way rocker switch that get power from the battery to heat the glow plugs, prime the engine, start the engine and provide power to the fuel pump.
Here is my problem, don't have much of a wiring diagram, but have gotten a new smaller alternator and regulator. Believe it has 2 blue wires and 1 red. How does the current from this alternator get to the battery to charge it? Thanks

 

[PoTreeBoy]

There's a WorkShop Manual to download on KubotaBooks that includes a diagram. The smaller rigs have a dynamo instead of a regular alternator. The dynamo outputs AC on the blue wires that is converted to DC by the full wave rectifier in the regulator. I'm no EE, but if I read the diagram below correctly, the regulator just shunts excess current to ground to regulate the voltage output on the red wire.

 

[ddg]

There's a WorkShop Manual to download on KubotaBooks that includes a diagram. The smaller rigs have a dynamo instead of a regular alternator. The dynamo outputs AC on the blue wires that is converted to DC by the full wave rectifier in the regulator. I'm no EE, but if I read the diagram below correctly, the regulator just shunts excess current to ground to regulate the voltage output on the red wire.

View attachment 175669

I've got everything working except the charging system. I used a toggle switch in place of the ignition switch, to start/stop and get the gauges working. It looks like all that is required to get it up and charging is to connect the 2 blue wires from the dynamo to the regulator then connect the red wire from the regular to the engine ground, that leaves the black wire which I can run to the starter connection to the battery. As I have a cut off switch on the battery, looks like that will get it going. Or am I missing something????? Thanks

 

[PoTreeBoy]

I've got everything working except the charging system. I used a toggle switch in place of the ignition switch, to start/stop and get the gauges working. It looks like all that is required to get it up and charging is to connect the 2 blue wires from the dynamo to the regulator then connect the red wire from the regular to the engine ground, that leaves the black wire which I can run to the starter connection to the battery. As I have a cut off switch on the battery, looks like that will get it going. Or am I missing something????? Thanks

The black wire is ground. The red wire goes to the positive battery terminal, preferably after the fusible link.

 

[ddg]

The black wire is ground. The red wire goes to the positive battery terminal, preferably after the fusible link.

Are you sure??? The instructions that came with the regulator said the RED was required to be connected to the vehicle frame while the remaining wire, black in this case was to connected to the positive battery terminal. Just asking. Instructions could be incorrect. Thanks.

 

[PoTreeBoy]

Are you sure??? The instructions that came with the regulator said the RED was required to be connected to the vehicle frame while the remaining wire, black in this case was to connected to the positive battery terminal. Just asking. Instructions could be incorrect. Thanks.

A. I don't know where you got the regulator. If it's from Kubota, red is positive and black is negative.
B. Unless your tractor is positive ground, which would be highly unlikely and against the diagram, the black goes to ground, unless
C. You got a non-standard regulator.

If you want to make sure, hook up the dynamo and leave the red and black disconnected. Start the tractor and check for positive and negative on the red and black with a volt-ohm meter.

 

[ddg]

Are you sure??? The instructions that came with the regulator said the RED was required to be connected to the vehicle frame while the remaining wire, black in this case was to connected to the positive battery terminal. Just asking. Instructions could be incorrect. Thanks.

Got a message from the supplier where I bought the dynamo and regulator and they stated some of their orders had the incorrect instructions enclosed. They allege to attempting to contacting each customer to advise of the mistake but I didn't get anything. Yes, the parts are Kubota. So, I am connecting the blue wires from the dynamo to the regulator, the black to the tractor frame and the red to the battery wire at the starter with a fuse. Wonder how much heat the regulator can survive, wonder if it would be a good idea to mount it outside the hood? Thanks again.