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Old 02-04-2011, 10:54 AM   post #1 of 14
TominCT
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Default 1970 Sears Suburban ignition questions

Electrical noob questions:
My ignition has crapped out on both of my 1970 SS-12s. While I was at Lowes I came across a ignition set with key for $9 and bought it on a whim. As I know very little about the electrical's on the SS12 I have a few questions:
Can I use this ignition for the SS12. The original ignition I recall is a 4 prong and the one I bought is a 5 prong. Part number:OEM 725-0267A
If so, does anyone know what wire goes where?
If not any recommendations for which part# I will need to buy?
TIA
Regards,
Tom

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Old 02-04-2011, 11:09 AM   post #2 of 14
Small Fry
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Default Re: 1970 Sears Suburban ignition questions

This is the right replacement switch if you can find the one on the tractor now.

http://sears.pammar.net/switch.pdf
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Old 02-04-2011, 04:32 PM   post #3 of 14
Bill Kapaun
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Default Re: 1970 Sears Suburban ignition questions

EVEN IF the switches have the same # of terminals, they can be wired VERY differently internally!
For example, if a switch was designed for an engine with coil/points type ignition, substituting a switch for a later engine is going to fry some wiring.
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Old 02-04-2011, 05:12 PM   post #4 of 14
TominCT
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Default Re: 1970 Sears Suburban ignition questions

Thanks for the help guys. Small fry the diagram you mentioned is perfect. I did also find a possible replacement on Ebay:

31-2942 - Roper/Sears 365401R Ignition Switch

Replaces Roper/Sears 365401R. Also replaces switch 74R, 2210R, 5797H, 7486H, 9541H, 21037, 71577, 72841 and 511404.

Replaces OEM #: 365401R

Price $14.30
Is the 365401R ok to use instead of 365401?

TIA
Tom
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Old 02-04-2011, 06:03 PM   post #5 of 14
Small Fry
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Default Re: 1970 Sears Suburban ignition questions

I know the switch I listed does not have the 2 big post. It gives you some connectors to make it work.
The one you found looks like it does have the 2 big post. Maybe that's what the R means ? I think your tractor take's a 7486H witch is on that list. Going by what they are saying it will work.

You do have a Starter/Gen on that right ? These switches are for the starter/gen tractors.
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Old 02-04-2011, 07:10 PM   post #6 of 14
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Default Re: 1970 Sears Suburban ignition questions

Thank you again SF as your input is always appreciated. Both tractors have the starter/gen. After 41 years with probably both tractors being constantly started and turning off the motor with the original ignition switches, I decided to go with new replacements. The diagram you posted is a huge asset too.
Kind Regards,
Tom
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Old 02-14-2011, 05:24 PM   post #7 of 14
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Default Re: 1970 Sears Suburban ignition questions

Hooked up the new ignition switch (31-2942 - Roper/Sears 365401R Ignition Switch) and she starts when I hold the key on start but the moment I let go of the key it shuts off immediately. What would cause this? I'm thinking maybe a bad ground but would like thoughts before digging deeper.
Regards,
Tom
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Old 02-14-2011, 05:44 PM   post #8 of 14
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Default Re: 1970 Sears Suburban ignition questions

I would have to ask, Are you sure it's hooked up right ? Why did you replace the switch to begin with ? Does your new switch look like the old switch,with the 2 big post ?
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Old 02-14-2011, 06:59 PM   post #9 of 14
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Default Re: 1970 Sears Suburban ignition questions

Thanks SF for the quick response. I'll take a pic of the hookup with new ignition and post tomorrow. I think I did it correctly as I have 2 of the same tractors and used the other one as reference.
Regards,
Tom
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Old 02-14-2011, 09:41 PM   post #10 of 14
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Default Re: 1970 Sears Suburban ignition questions

Sounds like either those switches won't work like the seller said they would, or you have a wire mixed up.

The M terminal is the kill wire. That wire goes to the lower front corner of the engine shroud. There is a little screw it hooks to. Make sure you have that M wire right on the switch.

You have to becareful you don't get them mixed up or you could burn up the solid state unit. $$$


http://www.mytractorforum.com/showthread.php?t=172963
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Old 02-23-2011, 11:45 AM   post #11 of 14
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Default Re: 1970 Sears Suburban ignition questions

The ignition works perfect now. I rechecked the wires I originally connected and noticed that I indeed had installed them on the wrong prongs.
I bought the new ignition on Ebay for $14.95 + shipping if anyone is looking to replace their broken ignition switch. Ebay search 2942-365401R and you should find it.
Thanks again for the help.
Regards,
Tom
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Old 02-23-2011, 01:09 PM   post #12 of 14
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Default Re: 1970 Sears Suburban ignition questions

Bravo! I love fixing wiring issues!
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Old 02-23-2011, 03:48 PM   post #13 of 14
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Default Re: 1970 Sears Suburban ignition questions

Good to hear you having it working.
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Old 03-03-2011, 06:23 PM   post #14 of 14
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Default Re: 1970 Sears Suburban ignition questions

I also am having an ignition issue with a suburban. I got a 64 7.25 DB and the switch fell apart. It has six terminals and a push button switch to the right of that. I can't find anything close to the switch and I am not sure what the button did - never pushed it. and it's broke too!
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