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Post by geo on Nov 4, 2016 7:38:17 GMT
Hi I can't get my alternator to work. I have checked it and its circuits are just like the one below. Help what do I have to do?
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Post by bettina on Nov 4, 2016 7:41:28 GMT
Are you the same Geo from cwd by any chance?
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Post by JohnV on Nov 4, 2016 7:47:15 GMT
first off ....... what do you mean by doesn't work ?
You need to tell us a lot more than that before we can even start guessing. It's like phoning up Rolls Royce and saying "my car won't take me to work this morning" you might get the reply "Well sack your chauffeur"
what exactly are the symptoms ? what have you tested ? what did you test it with ? what were the results of the tests ?
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Post by geo on Nov 4, 2016 8:04:38 GMT
first off ....... what do you mean by doesn't work ? You need to tell us a lot more than that before we can even start guessing. It's like phoning up Rolls Royce and saying "my car won't take me to work this morning" you might get the reply "Well sack your chauffeur" what exactly are the symptoms ? what have you tested ? what did you test it with ? what were the results of the tests ? No output When I take the negative lead off the battery it has + volts on it. I did sack the chauffeur
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Post by JohnV on Nov 4, 2016 8:13:10 GMT
does the ind light come on/go out ?
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Post by geo on Nov 4, 2016 8:16:05 GMT
does the ind light come on/go out ? Yes
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Post by JohnV on Nov 4, 2016 8:35:16 GMT
If the ind light comes on before you start and goes out when the alternator rotates that would indicate that the regulator is operating (not necessarily at the correct voltage though) this would also indicate that the slip rings, rotor and probably the trio diodes are ok.
Two possibilities I can think of
1) there is a broken connection between the positive end of the 3ph bridge rectifier and the positive output terminal
2) the bridge rectifier is U/S (It would only need one of the negative diodes to still conduct for the trio diodes to still supply the regulator)
My feeling would be that if you are going to do this yourself, take the diode pack out check connections and terminals and with the stator disconnected/unsoldered measure the diodes individually.
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Post by geo on Nov 4, 2016 8:43:44 GMT
Looking at the diagram I am going to have to reverse the negative side of the bridge diodes.
What do you think?
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Post by JohnV on Nov 4, 2016 8:49:01 GMT
Looking at the diagram I am going to have to reverse the negative side of the bridge diodes. What do you think? Bloody Hell ......... I fell for that hook line and sinker ......... and if I had spotted it you could have still come back again as there is no connection negative to earth ....... You rotten sod !!!
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Post by Gone on Nov 4, 2016 8:55:05 GMT
first off ....... what do you mean by doesn't work ? You need to tell us a lot more than that before we can even start guessing. It's like phoning up Rolls Royce and saying "my car won't take me to work this morning" you might get the reply "Well sack your chauffeur" what exactly are the symptoms ? what have you tested ? what did you test it with ? what were the results of the tests ? No output When I take the negative lead off the battery it has + volts on it.
I did sack the chauffeur If there is a circuit starting from the positive pole of your battery then the end you are going to connect to the negative pole will have positive volts on it until you connect it. The resistance of the circuit will then govern the amount of current that will flow. Even with something like an alternator which is intended to charge the battery, will if not spinning have sufficient internal leakage to show positive volts on an unconnected negative return. If think this answers your concern?
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Post by geo on Nov 4, 2016 8:56:29 GMT
Looking at the diagram I am going to have to reverse the negative side of the bridge diodes. What do you think? Bloody Hell ......... I fell for that hook line and sinker ......... and if I had spotted it you could have still come back again as there is no connection negative to earth ....... You rotten sod !!! I should have replied replaced the bridge. That is published on a well know website. Me thinks alternators are not well known by the publisher. I spotted it as soon as I saw it. I suspect it has been up for years.
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Post by Telemachus on Nov 4, 2016 8:59:31 GMT
I think you are being churlish. So there is a mistake in a diagram on Tony's site - which contains a wealth of information and is just there to be helpful to other people. Why not just point out the error courteously, rather than mocking? Not very nice.
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Post by geo on Nov 4, 2016 8:59:35 GMT
No output When I take the negative lead off the battery it has + volts on it.
I did sack the chauffeur If there is a circuit starting from the positive pole of your battery then the end you are going to connect to the negative pole will have positive volts on it until you connect it. The resistance of the circuit will then govern the amount of current that will flow. Even with something like an alternator which is intended to charge the battery, will if not spinning have sufficient internal leakage to show positive volts on an unconnected negative return. If think this answers your concern? This is with the alternator turning at 2000 rpm. The positive volts are from the negative alternator cable
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Post by geo on Nov 4, 2016 9:01:22 GMT
I think you are being churlish. So there is a mistake in a diagram on Tony's site - which contains a wealth of information and is just there to be helpful to other people. Why not just point out the error courteously, rather than mocking? Not very nice. Them that hold themselves up as gods and all that And I had not identified the site Churlish like you are to people when they are wrong. Pot calling kettle black me thinks
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Post by Telemachus on Nov 4, 2016 9:01:59 GMT
I think you are being churlish. So there is a mistake in a diagram on Tony's site - which contains a wealth of information and is just there to be helpful to other people. Why not just point out the error courteously, rather than mocking? Not very nice. Them that hold themselves up as gods and all that And I had not identified the site Yes you had. It is on the image. And if you knew Tony better, you would know that he absolutely doesn't hold himself up as a god.
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