Indiel alternator (nose model) does not load well

Well go to explain ... I have a new battery and without connecting anything at all the DSP d batter Measure it with digital tester when the engine is running and I take out the cable from the alternator that goes to the battery and put it in the tester and the negative I put it in the bourne and the tester goes crazy (I imagine that it is x the electrical noise of the spark plugs) so I cannot test when it gives ... and the light/light of the regulator turns

slight They touch the rings, one to the stator (nose so that they operation have the star coils), another one makes mass and the other two contacts are those of the ignition key and the one of the light of the foquito of the board that in theory would have to be turned off when the alternator loads well ....

I have an amperimeter connect it in series with a cable of the + of the battery to the same and the other terminal Nothing .... Always ta in 0 so I don't be driving me crazy ... and I don't want to take it to an electrician x that I want to be able to fix it and understand it ... thank you very much

If your tester alocates your current, the tester are not rectifying cc and ca for me that your rectifier is evil. Greetings from Queretaro, Mexico.