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430 Diesel wiring question


 
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dondittmar
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PostPosted: Sat Jun 19, 2021 1:22 pm    Post subject: 430 Diesel wiring question Reply to specific post Reply with quote

Still working on the 430 with the air cleaner missing the wire mesh(see post a few pages back). I am taking a look at the wiring on this tractor and it appears the starter solenoid has a small wire that appears to be hot when it is in start. Was that used on this model? I got the main cable coming from bat, the strap going into the starter, the start signal wire coming from the switch, and finally this 4th wire that appears to be hot only when the solenoid is activated. Looks like it was used at one time but nothing is there now and I just want to be sure I am not missing anything as I rewire thing.

I do have a service manual but the wiring section leaves a lot to be desired
 
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Jim.ME
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PostPosted: Sun Jun 20, 2021 2:15 am    Post subject: Re: 430 Diesel wiring question Reply to specific post Reply with quote

CVPost-dondittmar wrote:
(quoted from post at 17:22:44 06/19/21) Still working on the 430 with the air cleaner missing the wire mesh(see post a few pages back). I am taking a look at the wiring on this tractor and it appears the starter solenoid has a small wire that appears to be hot when it is in start. Was that used on this model? I got the main cable coming from bat, the strap going into the starter, the start signal wire coming from the switch, and finally this 4th wire that appears to be hot only when the solenoid is activated. Looks like it was used at one time but nothing is there now and I just want to be sure I am not missing anything as I rewire thing.

I do have a service manual but the wiring section leaves a lot to be desired


A small terminal on a solenoid, that is energized (hot) when the solenoid is energized, is generally used to by pass a ballast resistor in the ignition circuit. It would be connected to the switch side terminal of the coil or output terminal of the ballast resistor. It provides battery voltage to the coil during cranking to aid starting.
 
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dondittmar
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PostPosted: Sun Jun 20, 2021 3:39 am    Post subject: Re: 430 Diesel wiring question Reply to specific post Reply with quote

That was my thought, but its a diesel so that function is not needed.
 
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Jim.ME
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PostPosted: Sun Jun 20, 2021 3:44 am    Post subject: Re: 430 Diesel wiring question Reply to specific post Reply with quote


Its common to have that terminal unused, as the solenoid may be used in multiple applications.
 
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pcrh
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PostPosted: Sun Jun 20, 2021 4:34 am    Post subject: Re: 430 Diesel wiring question Reply to specific post Reply with quote


Hi:

As mentioned purpose of the 4th pole is to provide power to the coil and is generally used to by pass a ballast resistor in the ignition circuit. On ignition circuit which do not have ballast resistor then a 3 pole solenoid is all that is needed, but a 4 pole solenoid will also work. Just do not have the 4th pole touch ground during cranking.
 
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