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Cutout or regulator

H

hadley

Member
I have to put a new ignition switch in the wifes 51 MT. I need to know if it has a cutout or regulator before I order one though. This is where iam having trouble. I took out the battery and got into the back of the dash to see which it had but got stumped because it looks like a small regulator but is the size of a large cutout and only has two wires going to it not 3 or 4 like any regulator I have ever worked with. One terminal is marked battery and the other is not marked but I traced the wire to the generator. I will try and attach a pic. Any help with what I have is greatly appreciated.
mvphoto23770.jpg

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It's obviously a cutout, and the parts catalog confirms that. "Cutout, AM352T, sub for AM809T, Delco #1116816."
 
There is only one switch for any M series tractor. AM 357 T. Don't see why vendors have a problem understanding this but it seems they all do.
 
"[b:654c4848f0][i:654c4848f0]I need to know if it has a cutout or regulator before I order one though.[/i:654c4848f0][/b:654c4848f0]"

Your photo displays a cut-out relay.

Take a look a the photos below of "Rusty" one of our 1951 MTs.

The photo below displays the cut-out relay and wiring.

a189747.jpg" width="650"




The photo below shows the wire from the cut-out relay to the ammeter.

a189748.jpg" width="650"




The photo below shows the wire from the cut-out relay to the armature terminal on the generator.

a189749.jpg" width="650"


Hope this helps.
 
Thank you guys. Where I was confused is that every vendor lists 2 switches and they say one for regulator and one for cutout and there is about $20.00 difference between the two. I was pretty sure that was a cutout as I have never seen a regulator with only two terminals. Next question can I order either switch? I ask this because the expensive one is the one that says M series with cutout and the other says all M series with regulator?
 
"[b:654c4848f0][i:654c4848f0]Next question can I order either switch?[/i:654c4848f0][/b:654c4848f0]"

Take a look at the photo below of the ignition switch on "Rusty" one of our 1951 MTs.

a195292.jpg" width="650"


If both switches have these four terminals, then either switch should work.

The new switch should probably come with a diagram.

You might consider "marking" the terminals/wires on the old switch to help identify them later.

Hope this helps.
 
Since you have a Cutout Relay, I suggest you order the correct matching switch "for a cutout relay". A switch "for a cutout relay" should have the wiring terminal that connects down to the FLD post on the Generator and its what supplies a resistor (mounted on switch) to ground for LOW charge, but dead grounds it for HIGH charge. If you had a Voltage Regulator, the gennys FLD post wires to it and NOT the switch and such a switch may not necessarily (unless its there anyway) have the resistor nor a terminal for wiring to FLD on the genny, because with a VR there's no need for nor connection nor a field resistor so that switch could be different. But I cant say for sure not seeing the switch. I thought all those M;s used cutouts instead of a VR ??? M Man should know, here's the diagram he posted on johnnypopper

NOTE BOTH the switch and cutout relay need good ground connections to work.

John T
M-1-JPEG.jpg
 
The second switch they all list is for the numbered series with a regulator. It will not work on an M without modifications. The resistor on an M actually is resistance to ground for the field terminal that go's to the generator to vary the charge rate. You have a low charge and a high charge on that M switch because there is no regulator - only the cut out. If I'm not mistaken on the numbered series that resistor is actually a voltage path lowering it for the lights and or coil.

Only when an M has had it's charging system changed can you use the cheaper one and then it will be wired differently.
 
The switch for the cutout will also have resistors to vary the rate of charge that is why it is more money. You need that. Next question, is your cut out good? If not think outside the box and use a diode. A diode has no moving parts.
 
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