05-15-2021, 07:02 PM | #1 |
Member
Join Date: Aug 2013
Location: Rochester WA
Posts: 34
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Horn Help
I have a 6 volt 1929 model A with a Stewart Warner horn which appears to be original to 1929 as the motor and insides look pretty old fashioned. It works good but there seems to be a very slight short to ground somewhere that gradually discharges the car battery. But not enough to sound the horn when just sitting. Again when everything is hooked up and the horn button is pushed on the steering wheel the horn sounds loudly. (If I put a test light between the positive/ground cable and the positive terminal on the battery it lights when doing nothing and goes out when the horn wires are disconnected thus indicating a slight current draw) I used a ohm meter and found there is always continuity between both of the input wires on the little insulating block under the horn cover and the mounting bracket on the horn body. So I am guessing there is a slight short somewhere in the horn. Or maybe I am off base and the whole trouble is in the horn button and/ or wiring to the button on the steering wheel. Any thoughts?
For a long time I used some cork gasket material and tape to insulate the horn at the mounting stud under the left head light and everything worked fine. Thank you Thank you. |
05-15-2021, 07:34 PM | #2 |
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Join Date: Jan 2021
Location: Waynesboro Va.
Posts: 211
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Re: Horn Help
I had trouble along the same lines with my 30. Figured out if I took the back cover off there was no issue. Finally realized that the cover screw was too long and when I tightened the cover it would go in and short out. That would be a place to start.
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05-15-2021, 08:44 PM | #3 |
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Join Date: May 2010
Location: Concord CA
Posts: 635
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Re: Horn Help
The horn motor should be isolated from ground. You can't measure between the two horn terminals with an ohmmeter, you will always get a reading, this is normal. Either horn terminal to ground should be an open circuit.
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05-15-2021, 10:10 PM | #4 |
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Join Date: May 2010
Location: Portland, Oregon
Posts: 5,902
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Re: Horn Help
This is the first thing I’d check. S-W horns are extremely well made, eeliable, and usually trouble free if maintained (oiled regularly!)
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05-16-2021, 08:51 AM | #5 |
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Join Date: May 2010
Location: Bismarck ND
Posts: 1,189
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Re: Horn Help
Check the wire on the horn that comes from the steering column(blue wire) and see if you have any continuity to ground. If not, the problem is inside the horn.
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05-16-2021, 08:29 PM | #6 |
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Location: Grafton, MA
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Re: Horn Help
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05-16-2021, 11:12 PM | #7 |
Member
Join Date: Aug 2013
Location: Rochester WA
Posts: 34
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Re: Horn Help
Thanks for everyone's input. I figured out the problem, one of the very stiff uninsulated wires going to one of the field coils on the horn motor was bent slightly and just barely touching one side of the horn frame. I bent it back about 1/4 inch and problem solved.
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05-16-2021, 11:40 PM | #8 |
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Join Date: Jun 2017
Location: Walla Walla, WA
Posts: 1,045
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Re: Horn Help
Not entirely on topic, but worth repeating. If you ever decide to take a Stewart Warner horn apart to clean and fix, beware that the nut that holds the warbler to the motor shaft is a REVERSE THREAD. Turning it too hard the wrong way can twist it right off. (Don't ask me how I know this).
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