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1934. If you read the FUN PROJECTS instruction sheet that comes with the regulator it states to set the third brush on your generator at a maximum of 20 amps before installing or connecting the regulator. For an original 1934 Ford 3 brush generator a setting of 15 or 16 amps is high enough and was the original specification and 20 amps is too high. A setting of 15 amps will ensure your generator windings do not overheat especially if you are doing a long run at night with headlights on and the generator working at its maximum third brush setting. It will have a long happy operational life at no more than 15 amps. I have a FUN PROJECTS round voltage reg on my stock 34 Ford and it works very well. Regards, Kevin.