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A Little Off Plumb
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Does anyone have a diagram of how a key switch 's contacts work when the key is turned. I am working on a 1256, switch # 1721 409.
Here is what is shown in the tube frame manual - hope this helps.
 

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Some of those are wired different, depending in what type of ignition the TRA12 has. There were 2 different types of solid state ignition on the TRA's, one was with only a stator under the flywheel and the other had the stator behind the flywheel and an ignition module that was typically screwed to the blower housing. Those two had completely different wiring from the ignition switch to the ignition coil and module.
 

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Some of those are wired different, depending in what type of ignition the TRA12 has. There were 2 different types of solid state ignition on the TRA's, one was with only a stator under the flywheel and the other had the stator behind the flywheel and an ignition module that was typically screwed to the blower housing. Those two had completely different wiring from the ignition switch to the ignition coil and module.
Yes, it is correct that the TRA12D used 2 different Solid State Ignition types. However the factory wiring from the ignition switch was the same regardless. The only wire from the factory harness that connects to any part of the ignition system is the kill wire, which connects the negative side of the coil. Wisconsin later recommended that a separate, independent kill switch be used to avoid any possible stray voltage from the original ignition switch reaching the ignition coil.
 

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If you look closely at the wiring, they are different! The wiring for the external module shows the minus (-) side of the ignition coil is tied directly to ground at the coil mount. The plus (+) side of the coil comes from the module. I've been around and around with this on my 1256 and this is the way mine is wired. Refer to the wiring diagram in the manuals section.
 

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Discussion Starter · #7 ·
That is very interesting. I did print out a wiring dia from the manuals' section but is there more than one listed?
 

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I am still adrift with this 1256 wiring. I see no way for that wiring diagram to work. When I turn the key on it puts power to the white wire that goes to ground near the voltage regulator and then the fuse is gone. This is a new key switch that I am using and I have read it out with a meter and all contacts make up like they should. I am at a loss on this one.
 

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DR. Bolens
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I am still adrift with this 1256 wiring. I see no way for that wiring diagram to work. When I turn the key on it puts power to the white wire that goes to ground near the voltage regulator and then the fuse is gone. This is a new key switch that I am using and I have read it out with a meter and all contacts make up like they should. I am at a loss on this one.
Is this a Genuine Bolens switch? Last I knew there was a similar looking one in aftermarket but the internals of the switch are different .
 

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Discussion Starter · #13 ·
The way I see it is when the switch is on the black to ground should make up with the black to the negative side of the coil thereby completing the circuit. When the switch is off then the contacts open and the engine shuts down.
 

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Discussion Starter · #14 ·
I finally got it figured out . I had the right PN key switch but I would not work on the 1256. Thanks to Bolens 1000 I now have the right key switch and all is well in my little town. Many thanks to all who helped me.
 
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