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08-30-2013, 12:38 PM | #1 |
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Join Date: Jul 2013
Location: Central NY & Central CA
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Convert Horn to 12V
BACKGROUND:
I am blessed that I finally convinced my best friend's widow to sell me his '30 Coupe. He died three years ago and during his last year, was mostly too ill to keep up with the routine maintenance. I have a lot of small stuff to take care of, but otherwise it's an excellent driver and a great 10-footer. Fortunately it's been kept in an enclosed garage in a desert climate, so it has not suffered from being allowed to sit. I've driven it several times during this period and it's fine. I'm trailering it to upstate NY in a couple of weeks where it will find its new home in my garage. I will go through the routine maintenance items before I do any significant driving. TODAY'S QUESTION: The coupe is equipped with a 6V pos ground alternator. I'm planning to eventually convert it to 12V neg ground, maybe as a winter project when I won't be driving it. One of the the items I had planned to do was rewire the horn field coil for 12V - I have the info from MAFCA and the enameled magnet wire on hand. The question is this: the horn is a rare GIM manufacture rather than the more common Sparton horns. Would rewiring the field coil ruin the value of this rare item? Should I just find another horn to convert and keep the GIM as is? |
08-30-2013, 12:47 PM | #2 |
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Re: Convert Horn to 12V
I guess I'll be the first to ask---why convert to 12V?
Bob |
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08-30-2013, 12:55 PM | #3 | |
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Re: Convert Horn to 12V
Quote:
It sounds like the 6 volt horn works, so leave it be. Better to take a non-functional horn that needs to be rebuilt and do the conversion to 12 volts at the same time. Then you are not taking a good working 6 volt unit out of circulation, you are adding another horn to the pool. I won't debate the merits of converting a car to 12 volts.
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08-30-2013, 12:59 PM | #4 |
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Re: Convert Horn to 12V
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08-30-2013, 01:03 PM | #5 | |
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Join Date: Jul 2013
Location: Central NY & Central CA
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Re: Convert Horn to 12V
Quote:
My main concern is that the GIM horn is a rare item, would rewiring the field destroy its value as an artifact? As for rebuilding it, I will probably have to do that anyway. It's not in the greatest of shape, needs to be repainted, cleaned, new brushes, etc. It does function, more or less. |
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08-30-2013, 01:20 PM | #6 |
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Location: Anchorage, Alaska
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Re: Convert Horn to 12V
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08-30-2013, 02:13 PM | #7 |
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Location: Southern California
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Re: Convert Horn to 12V
Bratton's sell a horn resistor specially made to use on a 12-volt car with a 6-volt horn It fits out of sight inside the end housing of the horn. It is fully insulated and has the wire connections to make an easy hook up. I had one on a 12-volt 29 coupe for years. It worked well.
Horn resistor, part number 20050, $24.75, page 89 in their catalog. Tom Endy |
08-30-2013, 03:20 PM | #8 |
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Re: Convert Horn to 12V
If you feel that you must convert then the resistor in the best bet.
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What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II |
08-30-2013, 05:10 PM | #9 |
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Join Date: Jul 2013
Location: Central NY & Central CA
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Re: Convert Horn to 12V
I used to help with an adoption forum, and circumcision was the hot button issue there. I guess 12V vs 6V is the circumcision of Model A'ers!
Seriously, this is a great source for information and I appreciate everyone's point of view. |
08-30-2013, 05:21 PM | #10 |
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Re: Convert Horn to 12V
Yes, most that convert to 12 volt simply use the resistor and keep original horn
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08-30-2013, 05:31 PM | #11 |
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Join Date: Nov 2010
Location: Florham Park, NJ
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Re: Convert Horn to 12V
I tried a few different value resistors on mine and it didn't sound as good as it did when I rewound the field.
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1965 Lotus Elan S2 1930 Model A Sport Coupe |
08-30-2013, 06:18 PM | #12 |
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Posts: 94
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Re: Convert Horn to 12V
Sir,
It is you that must make the decision 6 volts or 12 volts. You have heard from other guys of their preference and experience in using risistors, etc. Works for some and not so for others. The 6 volt systems works great. A 12 volts system seems to be the new thang these days. Difference strokes for different folks. Should you have questions, I can be reached at: [email protected] Regards, Neil THE HORN MAN |
08-31-2013, 09:51 AM | #13 | |
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Re: Convert Horn to 12V
Quote:
At least he is changing because he wants to and doesn't believe he has to because 12v is "better".
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What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II |
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