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If they don’t fail often found the oem one used for cheap. I guess it won’t hurt to try. I thought it was the gps but it’s clean and works correctly. Thought it was the side stand but it kills the bike when it’s in the down position and works properly. It’s just that stupid light issue that’s driving me nuts. Only works when the kick stand is down.
I'll change my guess after looking at the wiring diagram. I can't see a diode failure that would cause your specific symptoms.
After re-reading your first description and guessing a few things.
I'm guessing you are starting the bike in neutral with the side stand down and you have a neutral light.
That you then put the sidestand up while still in neutral and still have a neutral light.
You put the bike in gear, light goes out, but when you go back to neutral it does not go on again.
When you say it goes on when you put the sidestand down, is it going on just as you start moving it down or after it pops locked down? (the sidestand switch opens just as you start moving the sidestand down)
I'm now leaning to it being the GPS and that the light is only coming on when the sidestand pops all the way down. The vibration of the sidestand locking is shaking a flaky GPS and allowing it to make contact. (The GPS is really close to the sidestand mount)