If it reads 15 to 20 all the time and even after long hours of use especially with lights off I fear it may overcharge the battery. Theres a chance the VR (if it has one??) may be bad,,,,,,,,,,or someone permanently dead grounded the Gennys FLD terminal cuz Billy Bob and Bubba told them it made her charge real good,,,,,,,,,,,or if it has the LHDB light switch charge control (uses cutout relay) the wire up from the gennys FLD post is somehow always grounded.....or the battery is bad like a shorted cell etc
With a good battery Id expect a high charge rate for a time (if it uses a VR) but then it would back off to 1 to 5 amps depending on RPM and lights etc. If it has the LHDB and cutout relay Id leave it on high charge maybe 30 to 60 mins (20+ amps)then put her on low charge (maybe 1 to less then 10 amps subject to RPM and battery)
Jim was kind enough below to post my Troubleshooting Procedure
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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