First place I'd look is at the main loom that runs along the right hand top frame rail under the tank. It probably means you'll have to take the tank off to do a proper visual check though.

It is a known issue for the loom to rub through on the frame rail, and more often than not it is the wiring to the fuel pump and injector that takes the biggest hit. It might not have been abraded enough to cause a short on its own, but a good soaking could quite easily have bridge an exposed core to earth.

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