Hope this info helps: I have a new old stock COOP generator, paper tag reads possibly TO-7521, unsure of last 2 digits. Generator tag stamped Autolite GEO 4818A-3 5D, This generator has a cut out relay mounted on it with a wire coming out of the generator body hooked to the underside of it, and a terminal coming thru the generator body with a nut on it for hooking a wire to it that I assume is the field lead, this lead is grounded on my running E3 as it has been before I got it 30 years ago, I believe there was a wire going to possibly the light switch to control charge rate originally.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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