LiMa too little juice

Hi, did someone have an idea why a “apparently” completely intact LiMa produced only about 1/3 of the normal voltage? Had first typed for cable break or similar, because the resistance was about 3x as high as normal. But those are ok, the error was on the measuring device (did short-circuited 0.5 Ohm). With a decent I come to 0.1 to 0.2 between the windings of the stator (measured on the plug). Otherwise he looks almost like new (is he actually also – about 3,000Km) Evtl are the magnets of the run. r too weak? How can I test this? I searched with the wrench all times but found no difference and he also “glued” well everywhere… Someone else an idea?