key always on?

No1Banana

No1Banana

Member
I while back I picked up a lock tumbler from a member here, and last night, thanks to da1nonlysteven (sent me a functioning engine), and oakberinger (tools,garage,beer,hands) I was able to use it.

Anyways, I hooked everything up and no matter what position the key was In, I always had spark.

Does anyone know the cause of this? Is it the wiring at the back of the tumbler? The tumbler came with another set of wiring, and I wonder if that's the problem? Since wiring harnesses are slightly different from model to model, I assume so are the tumblers?

Can anyone shed some light, before I start messing with the wiring?

Thanks
 
"lock tumbler" = ignition key switch, correct?

With magneto ignition, the kill function is executed (happy coincidence on that wording :21:) by grounding the secondary coil. Review the wiring schematic and you'll see that this is done via a switched ground; when the key is in the "off" position, the HT coil input lead is grounded to the chassis.

The question is: why this isn't happening on your bike?
Most likely possibilities: wrong switch for your model, something wired incorrectly/broken lead or, a problem with the switch itself. Time to break out the continuity tester & get to work. HTH
 
Disassembled the ignition switch last night. Pretty corroded. Cleaned things up as best I could. Swapped out the wiring portion, with a different unit. Same results. Spark at all key positions.

Next thing is to check the other end of the cables, where the switch connects to the rest of the wiring harness, and see if wires match.
 
Props to you for this step. These switch assemblies can be challenging puzzles. They were never meant to be serviced and can be assembled in more than one configuration. I'd strongly suggest a light application of dielectric grease to keep the internals clean, along with verifying proper function (at the switch) using a continuity tester. If the switch is working properly, then tracing the problem should be straightforward. On the other hand, if the switch is malfunctioning, your hairline may be at risk:102:
 
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