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Old 07-03-2010, 04:45 PM   #1 (permalink)
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Confused 66 mustang horn problem

Have a 66 mustang with the standard steering wheel (not deluxe). My problem is that if I only have one of the horns connected and it doesn't matter if its the HI horn or Low horn the horn will honk. When I connect both I get nothing. Car has the original wiring. I first thought contact at the horns were the issue, so I sandpapered both the spade on the horns and then the connector on the wiring. This did not change anything. So right now only one horn is connected so I can have a horn to pass inspection. How do I correct this? I'm sure someone may have encountered this before, however I looked back a ways in this forum and could not find an answer. Thanks in advance for your help!
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Old 07-03-2010, 05:19 PM   #2 (permalink)
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Welcome to VMF. If you have both horns connected do the both blow if the engine is running?

On my 68 if the car has sat for several days or I've played the radio without the car running the battery is just slightly down, maybe just barely 12V. If I push the horn ring
only one horn blows. Start the engine...they both blow.

The two horns are in effect connected in parrallel so two take twice the current as one. These old fashioned vibrating horns when a few years (40?) old need a little more current to wake them up kinda like me! Meanwhile the 40 year old wiring, regulator etc. give a little less current. Remember it's current that makes things run.
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My '64 1/2 vert. Ordered May '64. D code 4 speed, handling package, caspian blue, accent group, Ford blue manual top.

'68 vert. driver. Owned since '77. C code AT, AC, PS, P disc B, PT lime gold, standard black interior and top. NOS RF fender and left quarter.New top and folding glass.
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Old 07-03-2010, 05:22 PM   #3 (permalink)
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Note: most original vintage horns have an adjustment screw. This adjustment is very sensitive. Just a tweak either way can make it fully inoperative!
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Old 07-03-2010, 05:32 PM   #4 (permalink)
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I really haven't done any adjusting to the vintage horns since they have been on the car and they worked last year. Where are these adjustment screws located on the horn?
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Old 07-03-2010, 05:37 PM   #5 (permalink)
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Did you try both connected and engine running? That's a simple yes or no.
Sorry to be grumpy but I'm trying to help!
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Old 07-03-2010, 06:41 PM   #6 (permalink)
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Slim, Tried your idea of trying both connections with the engine running and both horns worked. Guss that means voltage was low previously. I learn something new every time I read this Form. Thanks for your assistance!
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Old 07-03-2010, 07:50 PM   #7 (permalink)
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A slight tweak of the adjustment screw(s) might do it. maybe heavier wire to the horns. Maybe improve the ground connection. Point is your close!

Understand E=IR. A little higher voltage may be overcomming higher than normal resistance. The horns should blow with the engine off, someone may be backing in
to your car as you sit! Your not picky or stupid to want both to work!
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