Hi Jhonhander, yes, I did the multimeter test. A couple of hours ago I finished corroborating that the problem was not the donkey but the battery; I put it to charge and did not charge more than 11.30 volts after several hours. So I tested the donkey in the battery of a friend's car and it went very well. It means that continuity does not affect the proper functioning of the donkey, as suggested by BIN2013. The battery is about to turn four, so it was time to renew it. I hope that changing the battery will end the problem. Thank you both for your answers! Ignatius
Exactly why I asked you if you did the test with a multimeter because it will always give you continuity it is best to test it directly with a battery = D