Good to all, as I always come to you with my problems and I learn by the way, well I have a toyota corona 77 that had the mechanical regulator burned, I sent him to put an electronic one, the guy put one of three terminals of the brand Gauss. Well the issue is that before putting the regulator, he took out the alternator, disassembled it and put some diodes 5408 to each diode of the stator, the reason why, I do not know, also, according to the data sheet of diodes 5408, these hold up to 5 amps nothing more, when the gauss regulator data sheet says it handles 55 amps and it is a type B circuit, the regulator charges the battery but there are times that it does not, I got tired of telling the guy who made me to go see, then I decided to do it myself, I have electronic knowledge and I already did of many data about it to be able to check it, well when I start the engine I measure the voltage with the multimeter but it gives me an incorrect reading, that is to say it goes crazy and gives me a varied or itermit reading does not stay in the 14V as it should be, who could check to know what's wrong? I already checked the altermandor diode bridge also those added by this person and all measure correctly, I changed the coals too. Any idea what may be causing this problem? OBS tested the multimeter in another car and it works fine.

The regulation with electromechanical box, are different from the electronic regulation. The first regulates with the positive and the second with the negative. In the electronic regulation, the charge warning light is used to start charging and when the alternator is delivering the voltage, the same voltage reaches the light on both pins, so it goes out. The diodes that you put are for the field excitation circuit, so they are of less current. When measuring the voltage at the terminals of the battery, it should be scraped on them so that a correct reading. The other thing is to do it with the lights on, to know how much delivery with the maximum consumption of accessories. It is difficult to give a single probable cause, since it is not the original equipment. Possible causes such as measurement error should be ruled out. You must measure the minimum and maximum values delivered with the engine idling and at about 3000 rpm. In addition with the highest idle consumption and also at 3000 rpm. Comment results.