MT Ignition Switch

I ordered a new JD MT ignition switch. There are a couple of terminals I am not sure of. Please let me know if I am wrong. The instructions aren't so good. Appreciate the help!

IGN - Ignition
BAT - Battery Terminal on cutout
FL - Generator Field Terminal
TL - ? Lights ?
HL - ?

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Re: John Deere 40 wiring question - James Howell 20:54:18 05/02/18 (0)

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">There are a couple of terminals I am not sure of.[/i:654c4848f0][/b:654c4848f0]</font>"

Note the instruction sheet in your photo states that the ignition switch will work on a Model 40.

Take a look at the photo below of the same switch, as shown in your photo, installed in "BW" our Model 40T.



"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">IGN - Ignition[/i:654c4848f0][/b:654c4848f0]</font>"

Take a look at the [b:654c4848f0]Lamps and Wiring[/b:654c4848f0] diagram below.





Note the blue wire from the IGN terminal on the ignition switch to the NEGATIVE terminal on the coil.

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">BAT - Battery Terminal on cutout[/i:654c4848f0][/b:654c4848f0]</font>"

Take a look at the [b:654c4848f0]Lamps and Wiring[/b:654c4848f0] diagram below.



Note the wire with the 20amp inline fuse to the NEGATIVE post on the ammeter.

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">FL - Generator Field Terminal[/i:654c4848f0][/b:654c4848f0]</font>"

Flood Lights.

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">TL - ? Lights ?[/i:654c4848f0][/b:654c4848f0]</font>"

Tail Lights

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">HL - ?[/i:654c4848f0][/b:654c4848f0]</font>"

Head Lights.

Take a look at the [b:654c4848f0]Lamps and Wiring[/b:654c4848f0] diagram below.



Pure speculation on my part, but you might consider connecting the green wire for the lights to the FL flood lights terminal on the ignition switch.



Take a look at the [b:654c4848f0]Lamps and Wiring[/b:654c4848f0] diagram below.



Pure speculation on my part, but you might consider connecting the white wire from the F field terminal on the generator to the HL head lights terminal on the resistor.

The original ignition switch for the MT is [b:654c4848f0]AM 357 T[/b:654c4848f0] if you decide to exchange switches.



Hope this helps.

Thank you James. The ad said it would work for my MT. While it may work, I'm not sure it would work correctly. I am uncertain where to connect the generator up to as well. Do you think it would be in my best interest to return and purchase the AM 357 T? It is more than twice what I paid for this part.

IF you have a voltage regulator use that switch and the wiring diagram for a 40. If you still have a cut out relay send it back and get the correct one. They advertise
them all over the internet as being interchangeable but they aren't if it's still origonal.

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">Do you think it would be in my best interest to return and purchase the AM 357 T?[/i:654c4848f0][/b:654c4848f0]</font>"

Yes.

The AM 357 T is designed for both the M and MT tractor.



The AM 357 T ignition switch has been installed in our M and all three of our MTs.

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">I am uncertain where to connect the generator up to as well.[/i:654c4848f0][/b:654c4848f0]</font>"

The AM 357 T ignition switch has a designated generator field terminal to connect with the F field terminal on the generator.

Hope this helps.

"[b:654c4848f0][i:654c4848f0]If you still have a cut out relay send it back and get the correct one.[/i:654c4848f0][/b:654c4848f0]"

Agree.

I agree! Been there, dealt with that.

Thanks guys! I appreciate everything. I will return and order the correct part.

James, I appreciate all the help with the pictures as well, thank you again.