How to check a diode bridge
By construction, it is an electrical circuit designed to convert AC into direct current in a car. The diode bridge consists, as a rule, of 6 diodes and is installed on the generator housing. Such a rectification in electrical engineering is called full-wave.
Depending on the operating conditions of the vehicle, the diode bridge may fail earlier or later than the time stated by the manufacturer, but anyway, any parts will wear out. Most often this happens when moisture gets into the generator (car wash, crossing water obstacles) or in winter, when inexperienced owners confuse the polarity of wires when “lighting up” from another car. If the diode bridge fails, the car battery does not receive a recharge, or, conversely, is recharged, which leads to boiling electrolyte.
Check the diode bridge yourself best with the help of a warning lamp (carrying) or a tester. For completeness, it is desirable to use two methods.First, we connect a diode bridge plate (also negative) to the negative terminal of the battery, which is pressed against the generator case. Then connect one end of the carrying to the positive terminal of the battery. With the free end of the carrier, we touch the output terminal of the additional diodes, the positive terminal bolt and the connection points of the stator winding. In all cases, the lamp should not light up. If it lights up, the diode bridge is pierced.
The next step is to test the diode bridge independently for a break. To do this, we change the connection of the negative plate of the diode bridge from the negative terminal of the battery to the positive one, fix one end of the carrying to the battery minus, and connect the free end of the carrying at the same points as before. In this case, the lamp should be lit bright light. If it does not glow, a diode in the circuit has broken at one of the terminals.
With the help of a tester, the diodes are checked as follows: we set up the “ringing” mode of semiconductors with a limit of 1 kOhm and start “ringing” each diode. If the diode is healthy, the value in one direction will be 400-800 Ohm, and in the other - infinity.Car owners who can handle a soldering iron and tweezers can easily pull out a failed diode and replace it with a new one. The whole replacement operation will take no more than half an hour.
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