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Hi Vince, You may have a magneto ignition where the internal coil had died and someone added an external coil. What is your tractor's serial number? You'll find this on the transmission housing top adjacent to the shift lever. It will begin with a B. If you don't have a hand crank, take out all the plugs and turn the engine over by hand using the fan. If you hear an obvious loud "snap" sound a couple of times during one complete revolution, you have a true magneto and the external coil is some kind of add-on to correct a prior problem. I prefer a magneto ignition myself and have made some changes to my '42B that in my judgement has made it "better" - at least for my use as a working tractor. That includes a conversion to 12v with a modern alternator and voltmeter instead of the old 6v generator and ammeter. You might get some ideas by browsing my own website and the links therein. That is, unless you are a restoration purist that insists on originality over function :o). Your gas tank should be cleaned, modified and lined. I recommend installing a riser on the fuel bowl and a low point drain petcock in the bottom of the tank. I have used a two part epoxy for a liner that has worked out very well. Cleaning is addressed at the epoxy link. A source for an entirely new AC-B wiring harness is here. The AC forum on this site is also a good place to post questions and get different opinions from people who have/know ACs specifically. The B is a very popular model with many still out there and functioning as good as new.  Rod
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