79 gmc vandura; battery drain

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My latest project in a 1979 gmc vandura van. we have a problem with the battery draining. I have done all the preliminary checks and isolated the voltage draw to the horn fuse. my question is does anyone know what all is connected to the horn circuit? I have not been able to find a good schematic or wiring diagram

posted by  SSEGURB

Usually-- dome,map,courtesy,cargo lights.Sometimes the batt feed for radio clock and the aggravating buzzer or dinger.

posted by  lectroid

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