Attention: horn experts!!
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Instructor
Joined: Jul 2001
Posts: 189
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From: Berkeley Heights New Jersey
Attention: horn experts!!
Ok, just replaced the horn relay and upper contacts on my '75 with tilt/tele. Checked the continuity from the green relay to the horn -OK. Check the horn with a jumper to the battery -OK. Checked the continuity from the black lead at the relay to the harness before the steering column -OK. Took the cover off the column and tried to check continuity from the black at the harness before the steering column to the contact, or spring on the lower contact - no continuity. If I touch the steering column near the spring at the lower contact it completes the circuit. I am not good with understanding schematics from the manual. Anyone have suggestions?? Thanks much! :confused: :confused:
Race Director
Joined: Mar 2001
Posts: 11,601
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From: San Francisco CA
St. Jude Donor '07
Re: Attention: horn experts!! (bl75vette)
Do you mean when you touch the lower contact spring no current, but when you touch the outer casing on the column there is?
If I remember right, current goes through the lower contact spring to upper contact. When you push the upper contact, it closes it and goes through column casing to somewhere(sorry, i forget where, maybe ground). The relay works like this: current is always going through relay. When upper contact is closed, it grounds out relay and sends current to horn (at least i think that's how it works).
If I remember right, current goes through the lower contact spring to upper contact. When you push the upper contact, it closes it and goes through column casing to somewhere(sorry, i forget where, maybe ground). The relay works like this: current is always going through relay. When upper contact is closed, it grounds out relay and sends current to horn (at least i think that's how it works).
Instructor
Joined: Feb 2002
Posts: 126
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From: Altus OK
Re: Attention: horn experts!! (corvgreg)
I just redid mine. The horn button completes the circuit on the relay. This energizes the relay, allowing 12v to pass through the relay directly to the horn. I think that a 75 is the same as mine on the circuit. Orange wire=12v constant. Blk=ground through horn contact. Green=12v from relay to dual horns. A lot of the time, one of the horns causes most of the problems that you have with the circuit. My left horn was shorted. This caused a severe current drain which would blow fuses.
