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EFV-8 Club Forum / General Ford Discussion / horn short circuit?

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Posted By Discussion Topic: horn short circuit? -- page: 1 2     MICHV8 05-11-2020 @ 11:17 AM reply profile send p.m. Member Posts: 444 Joined: Jul 2010 I cut 2 gaskets from some extra top grain material and inserted them between the 2 plates (with the rubber spacers) on the horn bracket...solved the mystery ground. I'd sure like to know what is different between the passenger original bracket and this driver side repro, but I'm going to leave well enough alone for now. Thanks to all for the input and help... MICHV8 05-11-2020 @ 8:06 AM reply profile send p.m. Member Posts: 444 Joined: Jul 2010 37Ragtopman and Tom() here are a couple photos...the black face horn works fine and the gray is the problem horn TomO 05-11-2020 @ 7:55 AM reply profile send p.m. Senior Posts: 7256 Joined: Oct 2009 The horn motor MUST be isolated from ground on the horns with out a relay. The horn works fine when off of the car because the only path to ground is through the wire that you have connected to the battery. When you have it mounted on the car, you are getting a ground connection through the mounting. When you have a horn relay, the horns must be grounded to the chassis, because the relay provides the 6 volts. The horn button ground picks the relay and the voltage is supplied to the horns through the relay points. Mich, I don't know where the horn motor is getting it's extra ground, but you can try to isolate it from ground by placing a thin rubber gasket between the mounting bracket and the horn motor. You may have to use phenolic or other non -conducting washers on both the screw and the nut. You could just cut out a couple of washers with a gasket punch and put a piece of shrink tubing on the bolts. If that doesn't work, PM 3W2 and ask him for advice. He is very knowledgeable about the 34 cars. Tom 37RAGTOPMAN 05-11-2020 @ 7:16 AM reply profile send p.m. Senior Posts: 1962 Joined: Oct 2009 hi MichV8 how many wires coming out of the reproduction horn,? if one horn works correctly and one does not, that what you are telling us, did you take the cover off and inspect the insides,? I suspect that the repro horn is set up to use a relay,and would be rewired to work that way, I try staying away from these parts, seems like always presents problems down the line, let hear form you, 37Ragtopman MAINE post a few photo's to see what you are dealing with, MICHV8 05-11-2020 @ 6:48 AM reply profile send p.m. Member Posts: 444 Joined: Jul 2010 37Ragtopman Once again, wouldn't an internal short show up off the car as well? The only thing I see different from the passenger side and driver (problem horn) is that the driver horn bracket looks like a repro...are the small sleeves (rubberr?) between the 2 metal plates the possible problem? 37RAGTOPMAN 05-10-2020 @ 7:42 AM reply profile send p.m. Senior Posts: 1962 Joined: Oct 2009 HI MICHV8 I think you have a short in the horn, do you have one or two ? look at it very closely, any bare wires,, touching something they should not ? too long a screw at wire connection making a ground ? do you have a volt ohm Meter, to test it, ? a volt ohm meter is a must when trying to find electrical problem, I bought a Craftsman, meter, around $40.00 it even has a button that you can hold up to a household 120 220 volt circuit and has a alarm that lights up and buzzes, comes in real handy around the house or garage, when you want to test a outlet,to see if it is LIVE, let hear how you made out 1937Ragtopman post a few photo's this may help... MICHV8 05-09-2020 @ 1:03 PM reply profile send p.m. Member Posts: 444 Joined: Jul 2010 37ragtopman... The horn works fine off the car, so a horn internal problem not a candidate, right? 37RAGTOPMAN 05-09-2020 @ 11:39 AM reply profile send p.m. Senior Posts: 1962 Joined: Oct 2009 HI MICHV8 how about a few photos I think all FORD horns had 2 wires, in the 1930's my 37 has 2 wires,and I Have 2 horns, I have never saw a horn with a internal short, but I guess anything is possible, are you sure to have original Ford Horns and not a repros ? let see a photo of the inside of the horns,wiring connections. using a volt meter you should be able to tell where the short is my 2 cents 37Ragtopman like they say a photo is worth a 1000 words, MICHV8 05-09-2020 @ 10:38 AM reply profile send p.m. Member Posts: 444 Joined: Jul 2010 positive ground thanks MG...matches the schematic that came with the harness It seems to me the fender or fender brace is somehow providing ground, but I sure don'e see how. I've even tried wrapping the horn bracket bolt threads with electrical tape where the bolt runs through the headlamp bracket and still same problem...horn sounds with no ground wire attached. Even took horn apart and everything looks ok...mystery. MG 05-08-2020 @ 3:23 PM reply profile send p.m. Senior Posts: 1260 Joined: Nov 2009 1934 Ford Wiring Diagram:

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