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I have a 72 Sub 12. I need an ign switch so I took the old one out. That was probably 6 months ago. I was thinking it would be a two day job. One to take it out and the next to get it and install it. Well the guy at NAPA looked at me funny when I ask for a switch. So the I let the tractor sit. Now I want to get it running. I entered my model number in sears parts direct. I printed the wiring diagram off and as I was looking at it, I noticed its not the same as the tractor. The diagram says that it has a solenoid. The tractor dose not have a solenoid and I dont think it has ever had a solenoid. The tractor is designed for the battery cable from the batt to go to the switch and from the switch to the starter. Sears Parts Direct says the batt cables go to the solenoid and then to the starter. The really odd thing is sears parts direct says it needs a 2210R switch which is what it needs but the diagram is wrong.
 

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Discussion Starter #3
Thanks Hugh but I have that exact switch, came in the mail the other day. From the same seller and everything.
I just need the wiring diagram to know what wire goes on what post.
 

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Lol what a coincidence. I havent looked at the wiring on a non-Onan Suburban in awhile, so I cant be of much help. But I do remember that both my 8XL and Suburban 12 did NOT have solenoids, so I think youre on the money for that one.
 

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You need all the wire locations or just the battery cable positions. I could take a look at mine tomorrow maybe and come up with a rough idea. Just let me know.
 

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Discussion Starter #6
I need to know where all of the wires go. Thanks
 

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Here are two diagrams from my archive. One applies to the starter/generator model, and the other applies to the alternator model. (Note: the S/G diagram is from really old units that don't include the interlocks. They're shown in the other diagram, between the S terminal on the key switch and the starter. If you have 'em, keep them wired in.)
 

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I have a SS14 diagram that doesn't have the solonoid. It should help you out.

I believe that the wiring is identical to what you have.
 

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Discussion Starter #9
Thanks everyone. Ill take a look at it when I can. Ive been busy.
 

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I have a 72 Sub 12. I need an ign switch so I took the old one out. That was probably 6 months ago. I was thinking it would be a two day job. One to take it out and the next to get it and install it. Well the guy at NAPA looked at me funny when I ask for a switch. So the I let the tractor sit. Now I want to get it running. I entered my model number in sears parts direct. I printed the wiring diagram off and as I was looking at it, I noticed its not the same as the tractor. The diagram says that it has a solenoid. The tractor dose not have a solenoid and I dont think it has ever had a solenoid. The tractor is designed for the battery cable from the batt to go to the switch and from the switch to the starter. Sears Parts Direct says the batt cables go to the solenoid and then to the starter. The really odd thing is sears parts direct says it needs a 2210R switch which is what it needs but the diagram is wrong.
A model number with pictures of the tractor and wiring components would be a big help. There was a 1970 Sears Suburban 12 and a 1972 Sears SS/12 tractor. You can write down the model number and figure out which of the following wiring diagrams apply to your tractor.

http://sears.pammar.net/wiring.html

I plugged in diagram "H" for the 917.25550 1970 Suburban 12 tractor and got the following diagram.

http://sears.pammar.net/h.jpg

If all else fails you can rewire it with your own electrical system if you have the know-how to safely do it. At the moment I recommend sticking with the OEM wiring if you can get the parts you need. Keeping it original helps not only you but future owners and repair persons also.
 

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Discussion Starter #11
I completely frogot about posting the model number, 917.25371
 

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http://www.searspartsdirect.com/par...ts/Model-91725371/0247/1509200/00010081/00006

So are you trying to figure out how to substitute Part #11 with another switch?

From the looks of things your tractor has some of the same electrical parts as a 917.25740 Sears ST16. It looks like they both have the same 15 Amp fuse holder, ammeter, solenoid, tail light, and head light switch. The starter generator appears to be the big difference in the electrical systems.

I found the following voltage regulator on eBay but they don't appear to have it matched to the right tractor. They say it goes on a 1969-1970 Custom 7 but it looks like a Sub 12. I could be wrong because I haven't spent a lot of time on it.

http://www.ebay.com/itm/NEW-REGULAT...696-/271079124082?hash=item3f1d932c72&vxp=mtr
 

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Discussion Starter #14
Okay, then according to the information you provided you need Diagram "I" to figure out your OEM wiring.

http://sears.pammar.net/i.jpg

Did you snap any pics of the wiring you have?
http://www.searspartsdirect.com/par...ts/Model-91725371/0247/1509200/00010081/00006

So are you trying to figure out how to substitute Part #11 with another switch?

From the looks of things your tractor has some of the same electrical parts as a 917.25740 Sears ST16. It looks like they both have the same 15 Amp fuse holder, ammeter, solenoid, tail light, and head light switch. The starter generator appears to be the big difference in the electrical systems.

I found the following voltage regulator on eBay but they don't appear to have it matched to the right tractor. They say it goes on a 1969-1970 Custom 7 but it looks like a Sub 12. I could be wrong because I haven't spent a lot of time on it.

http://www.ebay.com/itm/NEW-REGULAT...696-/271079124082?hash=item3f1d932c72&vxp=mtr
Not yet. I will tomorrow.

I have the ign switch in the picture, but im trying to figure out what wire goes on what post of the ign switch. Ill take a look at it tomorrow.
 

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Not yet. I will tomorrow.

I have the ign switch in the picture, but im trying to figure out what wire goes on what post of the ign switch. Ill take a look at it tomorrow.
If wiring diagram "I" is used the diagram says to wire the following.

M = Motor

B = Positive Battery Cable Side of Solenoid (Should be a 5/16" thread)

S = Starter/Solenoid - Safety Switch Circuit to Solenoid (Should be a #10 thread)

Ground = to frame
 
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