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i have read on other threads that the suppressor and the diode were for the benifit of military radios to block interference, I don't believe civy trucks have them.

I had a similar issue on my 1009 that I also fixed tonite, I metered the conection before suppressor...good, after suppressor... good, but no honk...removed horn, grnd to bat-, jumper to bat +, horn Pos, no honk..., replaced horn unit,(cleaned grnd for good measure), bypassed...