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4 way flasher problems

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So, I went and bought a new flasher because I could not get mine to work (expensive square one). It works fine now with the truck off and can do my big trailers lights fine. BUT when the truck has its headlights on running or not, it simply buzzes loudly and cannot flash the lights, There is a little warpage of the place where the flasher plugs in I'm worried it has gotten very hot in the past to warp the plastic a little and I have no clue as to how to figure out whats wrong. I would assume a piss poor ground maybe?Thanks.

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