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Harry Ferguson Tractors Discussion Forum
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Question for JohnT Electrical Engineer in Indiana

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DennisPinOhio

12-23-2006 06:59:57




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A local Parts Supplier/Engine Shop sold me a kit and diagram to convert my TE 20 to 12 volts.
It has always worked great, but I do not like having the key start. It would be much safer to use the O.E. switch. I have already had one close call, so I intend to modify the start mode.
Here’s my question:
The ignition switch is a standard automotive style having “accessory” – “off” – “on” & “start” positions.
I am assuming that when one turns the key to the “start” position, all that’s happening is that the power is supplied internally, or jumpered, if you will, momentarily to that terminal. Why could I not wire from this switch to the O.E switch so that when I engage the “S” position on the gearshift I am essentially doing the same thing the ignition switch does?
I apologize if I haven’t stated this clearly, but I hope you get the idea.
Any ideas will be appreciated.

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DennisPinOhio

12-24-2006 06:48:48




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 Re: Question for JohnT Electrical Engineer in Indi in reply to DennisPinOhio, 12-23-2006 06:59:57  
Thanks very much to all of you for the good answers.
Happy Holy-days to all.



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John (TR)

12-23-2006 18:09:39




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 Re: Question for JohnT Electrical Engineer in Indi in reply to DennisPinOhio, 12-23-2006 06:59:57  
third party image

Dennis
My 35 had an auto style switch in it as well. I just pulled it and installed factory type momentary contact push button and off/on/accy selector switch and new safety switch for the tranny. The switches are readily available. The factory selector switchis just that and does not have the spring loaded set of contacts. The dash had been hogged out for the auto switch so I reamed it a bit bigger and welded in a washer with the correct id flush with the dash. Your 30 won't have the push button on the dash.

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Jerry/MT

12-23-2006 13:14:50




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 Re: Question for JohnT Electrical Engineer in Indi in reply to DennisPinOhio, 12-23-2006 06:59:57  
If at present you can start your engine with a key switch on the dash, you must have a solenoid since I doubt your dash mounted key switch will carry the total starter current. If you want to rewire and use the original shift actuated starter safety switch, you need to wire your primary ignition circuit so that the key switch is in series between the starter and the coil. (Actually it coud be anywhere in that circuit.) Then the battery lead must go on one side of the starter safety switch that is mounted on the bellhousing. The other side of the starter safety switch goes to the lug on the starter. To start, you turn on the key to provide power to the ignition circuit and then use the trnsmission lever to actuate the starter motor via the safety switch just like it originally was intended. Hope this helps you. Jerry/MT, former aircraft propulsion engineer in Montana.

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Jerry/MT

12-23-2006 13:18:21




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 Correction!!!! in reply to Jerry/MT, 12-23-2006 13:14:50  
I said "... key switch is in series between starter and the coil...." That should read "... in series between the battery and the coil...."



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Gerald J.

12-23-2006 11:59:56




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 Re: Question for JohnT Electrical Engineer in Indi in reply to DennisPinOhio, 12-23-2006 06:59:57  
You could wire it that way, but then you have two spring loaded switches that have to be operated at the same time to start.

I think it would be better to forget the start position of the ignition switch and run a wire from the ignition terminal to the transmission start switch. Move the wire from the ignition switch start terminal to the other terminal on the transmission start switch.

The original ignition switch probably was not like the universal one you have, but was just on/off.

Gerald J. Electrical Engineer in Iowa

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