RedDawg
Bronze Member
I bought this tractor well after the 12 Volt conversion was done to it. I was told the charging system worked but the Volt Meter wouldn't so I wasn't too concerned. I knew the 12V sealed beam lights didn't work but I figured that would be a fairly easy fix. Now that I have the hood off to fix a radiator issue I decided to tackle the small problem with the charging system. I spent last weekend gingerly unwrapping (breaking apart brittle plastic tape was more like it) gangs of wires in order not to break or disconnect anything as all I wanted to do was a simple repair. I didn't want to rewire the whole things. I had printed out the stock 6V wiring diagram and the standard 12V conversion diagram to see which mine represented the closest. As it turns out - neither.
I decided I needed to do my own wiring diagram. On it I numbered the wires and then I put tape on the wires themselves so I can make sure to account for everything. I've attached the wiring diagram.
My two goals are:
1.) Get the charging system working.
2.) Get the lights working.
A few notes and observations:
1.) The alternator is a Delco Remy with the following markings in various places
10-b
78amp
200y
N112
12V
Neg
I had it off last year and had it tested at an Autozone. The best we can tell it came from a 1985 3/4 ton Chevy diesel truck. It might be a 12SI. There is a single wire attached to it on the Batt terminal and it goes to the Voltage Regulator. Nothing is connected to the two blade connectors.
2.) The Voltage Regulator is a 6V regulator (see picture).
3.) The 12V Coil is an External Resistor type (see picture) and there is an external resistor.
4.) Although the alternator goes to the 6V voltage regulator, the voltage regulator itself isn't hooked up to anything. It is grounded to the same mounting plate as the terminal block. And there is another wire that comes form that same ground screw that went to the front of the tractor near the alternator but wasn't hooked up.
5.) Wire #3 from the Terminal Block also went to the front of the tractor in the same taped up gang of wires and also wasn't hooked to anything. But it's hot - ask me how I know!
6.) There's lots of cut off and taped up wires that go nowhere. I suspect those are from the original 6V wiring set up. I'm going to get rid of those if I can.
So, with the rat's nest I have under there and the age of the wires, I suspect the best thing to do is to rewire it. Any advice, drawings, suggestions or prayers would be most appreciated. When referring to a wire please include the wire number from the diagram is you can just to cut down on confusion.
Thanks everyone!
I decided I needed to do my own wiring diagram. On it I numbered the wires and then I put tape on the wires themselves so I can make sure to account for everything. I've attached the wiring diagram.
My two goals are:
1.) Get the charging system working.
2.) Get the lights working.
A few notes and observations:
1.) The alternator is a Delco Remy with the following markings in various places
10-b
78amp
200y
N112
12V
Neg
I had it off last year and had it tested at an Autozone. The best we can tell it came from a 1985 3/4 ton Chevy diesel truck. It might be a 12SI. There is a single wire attached to it on the Batt terminal and it goes to the Voltage Regulator. Nothing is connected to the two blade connectors.
2.) The Voltage Regulator is a 6V regulator (see picture).
3.) The 12V Coil is an External Resistor type (see picture) and there is an external resistor.
4.) Although the alternator goes to the 6V voltage regulator, the voltage regulator itself isn't hooked up to anything. It is grounded to the same mounting plate as the terminal block. And there is another wire that comes form that same ground screw that went to the front of the tractor near the alternator but wasn't hooked up.
5.) Wire #3 from the Terminal Block also went to the front of the tractor in the same taped up gang of wires and also wasn't hooked to anything. But it's hot - ask me how I know!
6.) There's lots of cut off and taped up wires that go nowhere. I suspect those are from the original 6V wiring set up. I'm going to get rid of those if I can.
So, with the rat's nest I have under there and the age of the wires, I suspect the best thing to do is to rewire it. Any advice, drawings, suggestions or prayers would be most appreciated. When referring to a wire please include the wire number from the diagram is you can just to cut down on confusion.
Thanks everyone!