Maybe you just need to polarize the generator. It amounts to momentarily connecting bat. on battery or other battery location to gen on generator. This sets up the magnetic field so the generator can charge. There is a write up under frequently asked questions that will give you more details. This is a simple but necessary procedure. On a cub this assumes you have the Battery+ as ground and the negative connected to the load. If you are wired the other way then change it so that when you are looking at schematics or reading about cubs you will be set up as original. The 48 cub was positive ground. Your question about what is a good ground. I agree with the other answers but it is as simple as a good ground looks like the battery ground to the system. I.e. there is no resistance between the connected ground and the battery terminal that is grounded.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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