Switch wiring advice for old Massey Ferguson 35.

daz22

New User
Hi all. I wonder if anyone would be able to help me with an issue I am having with my tractor which is an old Massey Ferguson 35. I today discovered that the switch wiring had actually fallen off two of the three terminals, and am trying to reconnect the switch. An issue is that the switch is so old that the codes on it don't all seem to be the same as I can find online. The switch actually has 5 separate terminals; there is IGN, BAT (both self explanatory) but there is also ACC, ST and also a centre one which I am certain is not used, and only seems to have a symbol next to it. The other problem I have is that - of the three wires that come out from the tractor to be connected to the switch, on of them has two wires connected into the one connector, and I cannot find anything online with a similar dual wire going into one connector. Would anyone be familiar with this type, and which wires go into what? I can double check the wire colours, and am sure that the terminals BAT and IGN would need to be used, but I would like to be more certain before I try again.
Many thanks.
 


This the back of the switch on mine if it helps .



36133.jpg
 
Is this an original switch?

Go to fergusonenthusiasts dot org, then resourses and electrical diagrams

ACC is accessory, ST should be Start if the switch is used to activate starter.

Where do the 3 wires go? BAT would come from either the L terminal on regulator if using a generator, or the generator/alternator side of the ammeter.

IGN would go to coil and possibly an hour meter, fuel gauge, or start button (could this be your 2 wires together?)

Above referenced diagram shows ACC going to a panel lamp, but no telling what modifications may have been made over the years.
 
(quoted from post at 19:38:18 05/20/16)

This the back of the switch on mine if it helps .



36133.jpg

Thanks for the picture. Is that two white wires going into the same connector? Also would you be able to see the markings on the back of the switch where each of the wires go, including the double white one? Many thanks.
 

Thanks for this additional information. I'll have a try again tomorrow and see whether I can work it out using it.
 

Switch should have 4 wires.
Terminal 3 brown to starter solenoid battery cable connection (this is the live)
Terminal 2 white, 2 wires, one wire to coil -(assuming + earth at the battery), one wire to lamp
Terminal 1 white/blue, to neutral switch and onto start solenoid coil.

I suspect that the switch I have is one from a later tractor as it has a key retention position not usually on the original .
 
(quoted from post at 07:45:47 05/21/16)
Switch should have 4 wires.
Terminal 3 brown to starter solenoid battery cable connection (this is the live)
Terminal 2 white, 2 wires, one wire to coil -(assuming + earth at the battery), one wire to lamp
Terminal 1 white/blue, to neutral switch and onto start solenoid coil.

I suspect that the switch I have is one from a later tractor as it has a key retention position not usually on the original .


Thanks for the further responses, and apologies for the delay in confirming back. I've been away from my property.

I've attached below a picture of the three separate lots of wires as they are. Strangely two with different colours are attached in the one connector, but I suppose this doesn't matter as it was working fine before the switch became detached. However going from those three lots of wires, would you know which I should connect to the different symbols on my switch? Also can I do any damage (to either the battery and/or the tractor) if the wrong wires are temporarily connected? Many thanks.
 
(quoted from post at 07:45:47 05/21/16)
Switch should have 4 wires.
Terminal 3 brown to starter solenoid battery cable connection (this is the live)
Terminal 2 white, 2 wires, one wire to coil -(assuming + earth at the battery), one wire to lamp
Terminal 1 white/blue, to neutral switch and onto start solenoid coil.

I suspect that the switch I have is one from a later tractor as it has a key retention position not usually on the original .

Hi. Does this pic of my wiring make any sense to you, as I'm a bit lost!!
 

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