larry butcher Posted July 27, 2015 Share Posted July 27, 2015 While removing old wiring harness from the horns on my '48 LC Coupe, I noticed a very fine wirewrapped around some fabric. I remember somewhere reading in my 45 years of paper thatthis was resistence drain to prevent shock? I'am enclosing a copy of 1 page of"Lincoln/Mercury Service News," Vol1-#13-- Nov. 1947. It is attached to horn relay. Any explanations? Link to comment Share on other sites More sharing options...
larry butcher Posted July 27, 2015 Author Share Posted July 27, 2015 I messed up again, you'll a magnifying glass to see the detail! L.E.B. Link to comment Share on other sites More sharing options...
Beltfed Posted July 27, 2015 Share Posted July 27, 2015 Can't get schematics to load. Link to comment Share on other sites More sharing options...
Beltfed Posted July 27, 2015 Share Posted July 27, 2015 Larry,That is indeed a curious one. My first guess, and only a guess, is arc supression for the horn relay. Link to comment Share on other sites More sharing options...
larry butcher Posted July 28, 2015 Author Share Posted July 28, 2015 Thanks for your reply, I'll continue to search for the paperwork, but your explanation does make sense Link to comment Share on other sites More sharing options...
19tom40 Posted July 28, 2015 Share Posted July 28, 2015 (edited) If you do not have this wire and blow the horn with your bare arm touching the window moulding, you will understand why it was needed. I can't load your pictures, so I can't comment on the Service Letter. Go to your original post and edit it to change the photos so that they will load faster and be large enough to read. Edited July 28, 2015 by 19tom40 (see edit history) Link to comment Share on other sites More sharing options...
Beltfed Posted July 28, 2015 Share Posted July 28, 2015 19tom40, that's really interesting and I don't believe I've ever seen it before. Can you tell me how it works? I looked at it and it just seems to be a small wire, maybe with some resistance, between the hot side of the relay and the wire going to the horn button. I'll admit, a capacitor would be a better choice than a wire or resistor for arc supression. Link to comment Share on other sites More sharing options...
19tom40 Posted July 29, 2015 Share Posted July 29, 2015 Here is an article about this problem. I believe that the diode is the best solution to the problem. The resistor just reduces the back emf so that you do not feel it. Good solid state diodes were not readily available back in the day. They were usually made of selenium and high back currents destroyed them, giving off a rotten egg smell. http://www.oldcarsweekly.com/news/qa-news/qa-with-kit-foster-june-25-2015 Link to comment Share on other sites More sharing options...
Beltfed Posted July 29, 2015 Share Posted July 29, 2015 And a poison gas. We had them in big radio transmitters, 100KW and up, back in the sixties and seventies before big powerful diodes became available. Thanks. Link to comment Share on other sites More sharing options...
larry butcher Posted July 29, 2015 Author Share Posted July 29, 2015 Thanks everyone who replied to my question, and especially 19tom40 ; you hit it right on. I remember when I removed theold harness, this very little fragile wire just disintegrated. L.E.B. Link to comment Share on other sites More sharing options...
Beltfed Posted July 30, 2015 Share Posted July 30, 2015 19tom40, Forgot to say...good catch! Also I was dead wrong, but then it had to happen sooner or later. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now