I hated to do this but if i wanted my horns to work, they needed a good ground. So i removed the nice shiny white paint down to bare metal where the bolt with the toothed washer goes through the core support.
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And installed the horns (previously tested). I have masked the radiator opening and all the various holes on the core support in prep for the flat black paint.
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And I (and anyone who looks closely) can still see the cad plated bolt through the horn bracket
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