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Farmall & IHC Tractors Discussion Forum
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W450 Start Button Wiring

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Brian Jensen

09-21-2007 18:47:17




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Hello to all who have helped me in the past. I have spent the better portion of 9 months now trying to get my W450 going. I have replaced every ignition part imaginable and recently acquired 2 used carbs from Rock Valley Iowa. Since I put the new carb on my tractor actually fires.... BUT... as soon as I release the start button it dies out almost as though I am turning off my spark when I let it go. I did have the start button out as I had replaced it with a key start as the button was pretty worn out and falling apart. I am wondering if I possible miswired something in the process that would be killing my spark. Does this sound like a possible explanation of why it would die out? Can anyone tell me how to rewire? Or, tell me where I can find out how to do it?

Thanks in advance.

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Janicholson

09-22-2007 20:12:59




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 Re: W450 Start Button Wiring in reply to Brian Jensen, 09-21-2007 18:47:17  
If this is now fixed, ignore this.
Starting at the starter relay on the side of the starter there should be three (possible 4) terminals. and four things connected 1}A heavy wire from the battery, 2}another smaller, but good sized #10 wire going to the Amp meter. 3} a wire coming from the start terminal of the switch "S" (or the start button if stock)going to the small S terminal on the starter relay. 4}And one heavy strip of copper running 2" to the starter motor. ((If there is a fourth terminal it will be small and might have an "I" near it. This goes to the coil side of the resistor at the spark coil to bypass the resistor when starting))

From the other side of the amp meter, there should be an assortment of wires, with one going to the Key switch B terminal. At the switch, the I -or Ign- terminal will connect to the non coil side of the resistor at the coil. This supplies voltage to the ignition when running, and starting, if the relay has no forth terminal mentioned above.

If the Ignition resister is burned out the tractor will operate as it does now if the starter relay has four terminals, and the I terminal is connected to the coil side of the resistor. THis is complex, but I hope helpful. JimN

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Brian Jensen

09-22-2007 20:35:20




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 Re: W450 Start Button Wiring in reply to Janicholson, 09-22-2007 20:12:59  
ok everything checks out as you stated, but you are the second person to mention a resistor. I replaced the coil that was on it, I think the previous owner had mentioned that it was a 6 volt system but when I brought the ignition coil into Bumper To Bumper they replaced it with a 12 volt resistorless coil, I know my starter has a 12 volt solenoid on it and I have a 12 volt battery so I am unsure what else could possibly be 6 volts other than the alternator. But I do not have a resistor of any kind in the ignition setup. Please clarify for me because as I stated previously the previous owner was a hack mechanic and would just remove broken parts and replace them with whatever he had on hand that may work.

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Janicholson

09-22-2007 21:09:01




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 Re: W450 Start Button Wiring in reply to Brian Jensen, 09-22-2007 20:35:20  
Almost all alternators are 12v. So that is not a concern. If the coil is resistorless type as you indicate, the start then quit issue could be in which wire is connected to the coil. Trace the wire/s from the coil going to the rest of the tractor. If one of the wires goes to the solenoid I terminal, it should be disconnected at both ends and not used with that coil. The only wire should be the wire going from the coil to the ignition switch I or Ign terminal. It should be on when the key is in the run position, and on when in the start position. The wire should be 14ga or 12 ga thickness. Good luck, JimN

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D Slater

09-22-2007 18:20:35




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 Re: W450 Start Button Wiring in reply to Brian Jensen, 09-21-2007 18:47:17  
Think you may have the 12 volt type W 450. If so the on off switch has 2 terminals and push button 2 terminals. Starter switch has 2 small terminals and a resistor is used at coil. If so the wire from on off switch that has power only when switch is on goes to one terminal on push button switch. Also the wire to resistor goes on same terminal. only the wire to starter switch goes on other push button terminal. On the other small starter switch terminal a wire goes from it to coil side of resistor so that coil is powered by full voltage while cranking. Sounds like you may only be getting power to coil from that sourse and power to coil is stoped when you quit cranking. If tractor is wired correct look for a bad resistor or open wire from resistor to push button switch.If wired as above, if the on off switch was bad it wouldn't power strater so it must be okay. A simple test light is all thats needed to see if there's power at resistor or coil with switch on.

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Brian Jensen

09-22-2007 19:42:15




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 Re: W450 Start Button Wiring in reply to D Slater, 09-22-2007 18:20:35  
Well I don't have a resistor. I have an aftermarket power switch and the wire runs direct from the start button to the poswer switch to the ignition coil. The other wire on the start button runs direct to the starter solenoid. The guy who owned my tractor previously was a hack mechanic and just removed broken parts rather than replace them. Where should the resistor be?



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ejr-IA.

09-21-2007 19:05:53




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 Re: W450 Start Button Wiring in reply to Brian Jensen, 09-21-2007 18:47:17  
Sounds like you need 3 wires at the switch 1 hot 1 to the coil and 1 to the starter solenoid.



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Brian Jensen

09-22-2007 12:33:35




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 Re: W450 Start Button Wiring in reply to ejr-IA., 09-21-2007 19:05:53  
ok I looked everything over. I have one wire that comes from the coil to the power switch (on when attempting to start) to the start button. Then I have one wire running from the start switch to the starter solenoid. That is all that is running off the start switch. I do have spark when the starter is cranking. but can't tell if I have spark once I release the start switch.



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