Alternators
Electronics Engineering
Selenium

How do alternator diodes work?

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2015-07-15 21:23:26
2015-07-15 21:23:26

Diodes allow current to flow in one direction only thus changing the alternating current produced inside the "alternator", to direct current which is required by your car's electrical system.

Think of them as check valves for liquids.

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Unless things have changed, the diodes are part of the alternator. The voltage regulator is attached to the alternator but the diodes are part of the alternator.

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The alternator in any Ford has diodes. Is that what you are asking about?

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There are 3 positive diodes and 3 negative diodes. The alternator produces AC voltage in 3 phase. Almost all car manufacturers import and domestic use 6 diodes. Diodes can be defective as either "open" or "shorted". An open diode reduces capacity of an alternator while a shorted diode causes almost no charging.

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It's not a good idea to to run your alternator with bad diodes. These diodes rectify the ac power generated by your alternator and turn it into dc power. You will destroy other electrical components in your car and will end up spending more money than the cost of simply replacing your alternator.

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A diode is a semiconductor that passes current in one direction only. The stator of the alternator generates three phase AC in a delta configuration. The six diodes are connected in a full wave bridge configuration that converts the AC to DC. At any instant of time, only two diodes are conducting, one to ground, the other to the battery. As the alternator spins, each phase takes turns, and the diodes turn off and on in turn as well. The result is a DC voltage with relatively little ripple.

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You would probably toast the diodes in the alternator.

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Have the alternator tested. I would suspect one or more of the diodes in the alternator are bad.

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On any alternator you can check with a voltmeter -- disconnect the positive going to the alternator, use a towel or electrical tape to isolate it, then start the car and you should read DC volts accross the terminal of 12-16v if the diodes are working, if they arent switch it to AC -- if you read > 2v your diodes are shorted I'm pretty sure the diodes and regulator are integrated into the Alternator -- so just replace that, otherwise you can take it off and they can check it at any Kragens for free.

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A three phase alternator will have six diodes in the rectifier bridge, three with their anodes connected to the phases, and cathodes commoned to the positive terminal, and three with the cathodes connected to the phases, and anodes commoned to the negative terminal, which is likely the housing of the alternator. The trio diodes arrangement will match the positive rectifiers, i.e. anodes to the phase connections, cathodes (denoted usually by a stripe around the body on small diodes), connected to the D+ terminal

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it will turn over and fuel pump works no fire

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Yes, and internal diodes convert it into dc.

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There are three exciter diodes on all alternators. They are connected to the stator windings. The purpose of the diodes is twofold. While the engine is running, it turns off the alternator indicator light and supplies power to the voltage regulator.

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If you would remove those diodes, it would generate AC power instead of DC. When the alternator makes electricity it makes it in AC, but your cars battery runs on DC. Those diodes calm down, if you will, the current making it DC. So if the diodes are removed please don't put it back in your car, you will blow up your battery. No one wants that.

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Shorted diodes in the alternator.

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Most vehicle diodes are located in the alternator.

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A brushless alternator assembly will have the following major components. These include the case, stator, diodes, bearings, shaft, regulator and coils.

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Yes, it can. A completely dead battery can blow the alternator diodes, at least in older systems - I am not so certain about newer systems, whether or not they are protected against this annoyance. In any case, the alternator is not generally designed to charge a battery from scratch, but just to keep it charged during normal use. The alternator will not be completely ruined, but it will not function until the diodes are replaced.

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Diodes have capacitance, placing a limit on their switching rate.

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Not if you jump it from the battery or electrical system of another car.

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Automobile alternator is used to supply the A.C current to the vehicles but the vehicles need D.C current so there is an diodes and rectifier to convert the A.C current into D.C current Automobile alternator is used to supply the A.C current to the vehicles but the vehicles need D.C current so there is an diodes and rectifier to convert the A.C current into D.C current Automobile alternator is used to supply the A.C current to the vehicles but the vehicles need D.C current so there is an diodes and rectifier to convert the A.C current into D.C current Automobile alternator is used to supply the A.C current to the vehicles but the vehicles need D.C current so there is an diodes and rectifier to convert the A.C current into D.C current Automobile alternator is used to supply the A.C current to the vehicles but the vehicles need D.C current so there is an diodes and rectifier to convert the A.C current into D.C current

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Two diodes, whether or not discreet, cannot work together as a transistor. The diodes and transistor have different profiles to optimize them for their specific functions

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A diode is a one-way valve for electricity. Since an alternator produces alternating current, the diodes allow electrons to flow in only one direction. That's how it converts AC current into direct (DC) current. There are usually three diodes in an alternator. It's called a diode bridge and is also known as a "rectifier". Revised answer. Yes it's called a diode trio. But there are actually a total of six diodes in a complete rectifier bridge. There are usually 3 stator windings. Each winding has two diodes. One diode allow positive to the battery and the other diode prevents positive from flowing to ground.

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It is the wire that supplies the initial field current to the alternator from the battey. Once the alternator is rotating the field current will be provided by the diodes from the current produced by the alternator. excitor wire is usually wired through the charging indicator light.

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An alternator does not need a gauge to work. It is used to monitor the output of the alternator.


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