Mf135 start switch.

[Mutton]

Started looking at my tractors problems at last.
Mf 135 diesel. French built. It does start with heat but needs some attention.

First I wanted to reconnect the thermostart.

But the wire to the thermostart has been disconnected. The start switch has been connected to the alternator. The start switch and alternator are obviously later additions.

I have bought an agriline start switch (part no 50777 on agriline), which I'm now thinking is not what I should have bought.

I cannot, despite looking for hours, find a good wiring diagram that shows me where various wires should go and with which start switch.

Also, I'm guessing when the alternator was added, the instruments were disconnected. I hope to get these plugged back in asap too.

Any help very gratefully received.

Thanks, nick m.

 

[c.oawright]

Here is a typical alternator (Delco SI) diagram. The lead marked 1 on the alternator can go through the ignition switch spare contact if their is on or it can go through a oil pressure switch. I prefer the oil pressure switch. Basically the number one terminal needs a positive voltage applied to excite the field winding of the alternator. If you want to use the ammeter it will go in series with the positive terminal marked BATT to the battery.
The starter switch applies a positive 12 volts to the solenoid terminal S to engage the starter.
Don't know about the heat option but am assuming the previous owner disconnect the thermo heat to get the excite wire to the alternator.

 

[Jim.ME]

(quoted from post at 11:09:44 12/19/20) Here is a typical alternator (Delco SI) diagram. The lead marked 1 on the alternator can go through the ignition switch spare contact if their is on or it can go through a oil pressure switch. I prefer the oil pressure switch. Basically the number one terminal needs a positive voltage applied to excite the field winding of the alternator. If you want to use the ammeter it will go in series with the positive terminal marked BATT to the battery.
The starter switch applies a positive 12 volts to the solenoid terminal S to engage the starter.
Don't know about the heat option but am assuming the previous owner disconnect the thermo heat to get the excite wire to the alternator.

He is in located in France with a France built 135. Hard to say what alternator it has. I didn't see a thermostart in the wiring diagram I have for a North American 135.

Here is a site with some wiring diagrams, from Quality Tractor Parts, I found with a search on the internet for France built 135 wiring diagram. Copy and paste into your web browser and remove the three * before searching. YT's filters site won't allow me to make a link to it because of the name.

https://www.q*t*p*online.com/sites/admin/plugins/elfinder/files/qtp/Wiring%20Diagram%20(002).pdf

 

[Mutton]

Thanks for the extra info on that. All looks fairly clear except for 1 thing...

My new starter switch (agriline partno. 50777) has terminals 1, 2 and 3. Terminal 1 has two tabs.

I'm fairly sure that...
Terminal 1 is the brown 12v wire connection.
Terminal 2 is to the thermostart.
Terminal 3 is to the safety start and then solenoid.

Where would the accessories come from on this?
Would it be the spare tab on Terminal 1?
(I realise that last sentence probably fully shows how ignorant I am on these matters).

In the diagrams there are 4 terminals on the starter, but all else makes sense with what I have.

 

[Jim.ME]

In looking at Agriline's site picture, I would call 50777 a 3 terminal switch. There are three terminals, one of which has two tabs. You would need 4 terminals to have 4 functions (power supply, thermostart/glow plug, starter, and accessories) as in the diagram. If the terminals are not marked, I would either determine what each terminal is with an ohm meter/continuity tester or contact Agriline and ask for identification of their terminals. I see Agriline has contact info on their website.

May be I am missing something and DavidP or someone will be along with a better answer for you.

 

[DavidP,South Wales]

Hi, when compared to UK MFs French and US tractors are so
different in terms of wiring etc that they could almost be different
makes. I’m currently rebuilding a French 155 and 133 for a customer
and the refurbishment of the wiring looms is yet to take place. I have
a ‘Revue Technique’ (workshop manual) which covers most French-
made 100 series tractors but I’m not sure if there is a wiring diagram
in it. It’s in my van at the moment. Will have a look tomorrow.
DavidP, South Wales

 

[Mutton]

Ok thanks David P. That could be useful.
And Jim, that sounds like a good idea if it remains a bit unclear. Agriline send overseas so they should know what the connections should be.

Will try to have a closer look at the start switch that is currently on the tractor. See if I can find out what it is and what connections it supposedly has. But as the instruments and thermostart are disconnected, I doubt it's fully suitable.

 

[Mutton]

Just to update this in case anyone has the same issue in future...

The answer seems to be the correct starter
switch is item no. 5061 if you get it from agriline.

It is a four Terminal switch that will work for a 135 with an alternator conversion.