I don't know the color codes, so if someone comes along and knows them, that will make this a lot easier. But if I found myself in this situation, this is what I would do:
Start by taking the battery cable loose before something goes terribly wrong!
Then pull the new switch out so you can see the back side of it. You will need an ohm meter to sort out the terminal configuration.
I am assuming the switch has 4 positions, off, preheat, run, and start.
There are 4 terminals on the switch, one will be power FROM the battery. The other 3 will be power out TO the various circuits.
Using the ohm meter, and the process of elimination, and knowing what each position is from having operated the tractor, you can figure out what each terminal does.
Start with the off position. There should be no connection between any terminals.
Then turn the switch to a known position. There will now be connection between 2 terminals. Write down that result.
Then turn the switch to another known position. Check the connection again, write that down. Continue through each position.
You will see a common connection between each position. That common terminal will be the BATTERY terminal, power FROM the battery.
Each of the other terminals will be power out TO each circuit.
Now that you have that information, go back to the tractor. Be sure the transmission is in neutral! Under the dash, separate the wires so they are not touching anything or each other. Sit the battery cable back on the battery post.
Using a volt meter or test light, check each wire for voltage. Should find one wire with voltage, that is the BATTERY wire, power FROM the battery. That will go on the BATTERY terminal of the switch.
Next, start with one of the remaining wires, touch it to the battery wire and observe what powers up. A small spark is normal. Example, if the run solenoid clunks in, that is the run position wire. Connect it to that terminal.
Then go to the next wire, if it makes the glow plugs solenoid pull in, that is the preheat wire. Connect it to the preheat terminal
If the last one pulls in the starter, connect it to it's terminal.
Should be pretty simple, just take it a step at a time. Be careful!
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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