Your car is possessed. Usually when an evil spirit possessed these car, the best suggestion is to check battery and grounding cables for corrosion and tightness, as well as ground buses, up near the front of the front doors under the carpet.
No not till after the new pump. All grounds are good and not enough corrosion to cause concern. I have pulled the relay and instead up the horn sounding all that is heard is a steady clicking from the relay block under the dash