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  #1  
Old 06-26-2025, 06:23 PM
justmetoday justmetoday is offline
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Default 782 coil wire questions

782 serial number 726137. The previous owner replaced the double coil with 2 single coils. He ran it like that last year.

I took the coils off to test them, now after reinstalling them I can't figure out how it was wired.

The first coil has a wire coming from under the frame to the pos side. There is a wire going from the neg to neg on the coils and 1 wire going from the neg on 1 coil to the points.

I can't figure out or find what wire goes to the pos on the other coil.

So, what wire goes to the other pos?

Yes it turns over but no spark, but I did find a broken wire that went from the neg to neg on the coils.
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Old 06-26-2025, 07:38 PM
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Both coils will fire at the same time, as they use a "wasted spark" system.

So a positive wire from the ign switch would go to both + terminals on the coils
And the wire from the points/condenser would go to - terminals of the coils.

I understand the dual coil is expensive, thus the dual coil replacement setup.
But 2 coils would use more current I would think, possibly shortening point life.
I have used a dual coil from an Onan welder years ago, for a long time without problems.
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Old 06-26-2025, 08:23 PM
justmetoday justmetoday is offline
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So should it be ign to pos and then pos to pos or run a separate wire from ign to each pos?

I'm looking at some aftermarket dual coils but I want to get this one running first.
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Old 06-26-2025, 10:20 PM
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I understand your concern, no need buying a expensive coil for a junk engine.

It does not matter as long as the power from the ignition switch goes to both plus ( +) terminals of both coils.
a single wire from the ignition switch will carry the power to anything it touches.
And both negative (-) terminals of both coils go to the braker points/condenser terminal or wire
its not rocket science, don't over think it.
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Old 06-27-2025, 06:15 AM
justmetoday justmetoday is offline
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Quote:
Originally Posted by ol'George View Post
I understand your concern, no need buying a expensive coil for a junk engine.
its not rocket science, don't over think it.
Thanks for the info and advice.
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Old 06-27-2025, 07:51 AM
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Glad to help as
sometimes something simple to one person is difficult to another.
Hope you have good luck with your project.
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  #7  
Old 06-27-2025, 10:12 AM
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RLause RLause is offline
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If I needed a coil, this is the one I would go with. I have used one like this and it worked great and the price is great. https://www.ebay.com/itm/12545714698...Bk9SR-rlxJv2ZQ
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Old 06-27-2025, 10:40 AM
justmetoday justmetoday is offline
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Ok, now I see one coil is bad, it tested poorly too. So will any 12v coil with internal resister work?
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Old 06-28-2025, 08:00 AM
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A general answer to your resistor question,
I would think a coil would say/specify either it needs a resistor in the 12V feed wire or it does not need a resistor.
Otherwise one would have look up the specific application of the coil you want to purchase to see if a resistor is needed in the power supply wire.
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  #10  
Old 06-28-2025, 08:40 AM
justmetoday justmetoday is offline
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The coils on there now say internal resistor. The price of them new are all over the place. What I'm wondering if a new one has an internal resistor and meets the ohms, is there anything else?
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