![]() ![]() To check for a possible bad alternator diode switch your voltmeter to a low setting on the ac alternating current voltage scale. Soak up any excess solder with desoldering braid leaving the hole clear. Heat the solder pad around the diode leg until the solder is molten and then gently pull the leg through from the other side using pliers. The pad will open by default in the PCB design (OVERRIDE: 0.1016mm), that is, the pad exposed copper foil, the outer expansion is 0.1016mm, and the wave soldering will be tinned. Please watch the following video below to watch the test being performed by one of our mechanics. A solder resist green soldermask opening can be placed on the pads, vias, and non-electric traces of this layer. With the vehicle in park press on the accelerator while a second person observes the headlights. ![]() With the engine running touch the meter probes to the battery terminals. To perform the headlight test start your car and turn on your headlights. If voltage is present one or more diodes has failed and the alternator should be replaced.Ī bench test will check the diodes and internal regulator and then tell you if the alternator is capable of producing its rated current and voltage. If the headlights flicker dim or get brighter when the accelerator is pressed down your alternator may be bad. Any amount of ac voltage would indicate a bad diode so youll need to replace the alternator. To test for this condition switch the voltmeter to ac voltage with the engine at about 1200 rpm the meter should read 0 volts. Proteus 8 solder paste how to#How to test for a bad diode in alternator. Set the multimeter to its diode test mode denoted by the circuit symbol for a diode which looks similar to an arrow. ![]()
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