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As you can see from the drawing, the engine stop component and lamp are two separate parts of the relay circuit - however - your sidestand switch is disconnected and joined up to ground via the twisted cable. This means that if there's a fault in the relay, power goes straight from fuse #3, via the relay fault, straight to earth. This would also interfere with the lamp/lamp switch part of the relay, so you could get anything weird showing up (lamp on/off etc) So I still think that the fault is something to do with the relay. Afraid you'll have to find it and test for short circuits.