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What does these starter wires do?

R

RedMF

Member
Just getting ready for a re-wire on my MF 240 this week. I found these two black wires attached to the bottom of the starter, but tucked round the back not connected to anything. They aren't marked on the 240 wiring diagram.
Does anyone know what they are supposed to be for?

41010.jpg
 
You need one small wire to energize your starter solenoid and on a gas engine one small wire is the ignition bypass that goes to the
distributor or to the distributor side of a ballast resistor (I'm old school). Those two small wires in your picture I'm not sure where they
go. I would check them one at a time with a test light when you energize the starter switch. If one has power then it needs to go to the
starter solenoid on the "S" terminal if it's marked as such.
 
I should have mentioned it's a diesel.
Strange thing is that whatever these do, can't be necessary for starting as it worked fine without them connected. I think they might be an earth but the only earth marked on the diagram is the negative battery lead to the engine body. I think I have seen a pic of a starter with an earth strap from that position on a starter.
The tractor did have battery drain problems if left overnight and these wires are badly cracked.
I'm wondering if they were an afterthought earthing which was disconnected later on.
Thing is I've got a car mechanic to agree to come over to help with the wiring and I guess he won't know as he doesnt usually work on tractors (best I could get).
 
Have you traced them to see where they go? If they dead end, I would assume they had been added, then abandoned, so will not go back on in the rewire.

If the other end is connected, just a matter of determining the function and replacing accordingly.

If your car mechanic really is up to speed on automotive electrical, he can wire that tractor blindfolded!
 
I think the safety start wire was a yellow one attached at the top back of the starter. That one is marked on the diagram.
The only other thing I can think of and I'm not sure why it would be two wires, would be something to do with the mess which was the fusebox which they put on the very early 240's. This fusebox appears on no wiring diagram I have found (and I have about 5 slightly differing ones to choose from).
 
Looks like a ground wire of some sort, can't see how it is connected to the cap but from this angle looks like ground
wire.
 
My 1997 MF-240-S is wired so it sorta resembles the wiring diagrams I have found. Close, but not exact. However I could not get the horn and front lights and a few other things to work some time ago, until I got upside-down and got underneath the dash and found two little mystery hidden fuses in little black fuse holders. Not shown on any wiring diagram. Replaced both fuses, and voila' everything works. I think the 240's were wired very casually.
 
(quoted from post at 03:53:47 10/02/16) My 1997 MF-240-S is wired so it sorta resembles the wiring diagrams I have found. Close, but not exact. However I could not get the horn and front lights and a few other things to work some time ago, until I got upside-down and got underneath the dash and found two little mystery hidden fuses in little black fuse holders. Not shown on any wiring diagram. Replaced both fuses, and voila' everything works. I think the 240's were wired very casually.
Click to expand...

Because they started making them in the UK in '79, then India and now Pakistan, I think they have gone through quite a few changes to the wiring.
As far as I know they dropped this fairly early on:


41020.jpg
 
(quoted from post at 06:12:43 10/02/16) Where do they go
Click to expand...

In all directions.
I'm not really sure where and I don't think Massey Ferguson where ever quite sure either.
 
(quoted from post at 07:10:07 10/02/16) Ejector seat. Connect with care.
Click to expand...

I think an ejector seat was only ever available as an optional extra from Aston Martin.
 
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