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Really good information there thanks a lot. I must ask, why would it kill the coil if I wired it to the original part in the key switch? If I cleaned it well I just don’t see how it could kill the coil and send current back in an original switch. I did admittedly also see that there is an aftermarket non oem ignition switch installed, so that does help prove your point... Thanks EricSeparating the Kill switch from the Ignition switch is a very very very good idea on the old Tecumseh engines. All it takes is a bit of moisture or wear or even a bit of dirt inside of the switch to Kill the Solid State ignition coil on those old Tecumseh engines. Any current fed back through the Kill Wire will instantly kill those coils and they are very expensive to replace IF you can even find a good used one. Leave it hooked to the headlight switch or wire it to a toggle switch.
Most likely the previous owner had 1 go bad. Every running Tecumseh HH100-HH160 powered tractor that I own got the same treatment.
The later ones with the Stator/alternator type charging systems had a bigger problem with the coil burning up because the Stator wires are wired into the same plug that the Stator wires are in down near the starter. If the 3 prong connector got any moisture or corrosion in it, it would cook the coil, If the switch had any wear or moisture or dirt in it it would kill the ignition coil.
Keep the Kill wire FAR FAR Away from Any power source and the Solid State ignition coil will most likely last for many many years. They have a large Capacitor, 1 small 3 legged Rectifier, trigger coil, a couple of diodes and a coil inside of them. There was a video on youtube years ago of someone rebuilding one of them but I can't find it. It's very hard to rebuild them because they are inside of an Aluminum body that is filled with Epoxy resin.