782 coil wire questions

[justmetoday]

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.

[ol'George]

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.

[justmetoday]

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.

[ol'George]

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.

[justmetoday]

Originally Posted by ol'George

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.

[ol'George]

Glad to help as
sometimes something simple to one person is difficult to another.
Hope you have good luck with your project.

[RLause]

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

[justmetoday]

Ok, now I see one coil is bad, it tested poorly too. So will any 12v coil with internal resister work?

[ol'George]

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.

[justmetoday]

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?