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Flat Battery Again
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<blockquote data-quote="timetraveller" data-source="post: 123814" data-attributes="member: 456"><p>There is some misunderstanding about Kubota alternators. Some people refer to Kubota alternators because they were taken off, or supplied for, a Kubota engine. As Peter writes above the small pancake ones used on some of those engines might indeed be manufactured by Kubota but I have never fitted or used one of those. I am not a fan of permanent magnet types. The one which Bill has was an Iskra as fitted to many of the smaller Citroen cars. They are very robust and can produce up to 30 amps. I then fitted a Nippon Denso alternator for Peter, These are slightly smaller in diameter when compared to the Iskra and slightly longer. These can produce 40 amps and are also very robust. Their big advantage is that the regulator is built into the alternator itself. All the early ones, perhaps 70 or 80 were the Iskra ones and the last few have been either the Nippon Denso or Densos. The Densos might be copies of the Nippon Denso ones (they look the same) and are cheaper. However, they have been 'discovered' by the kit car builders and supplies are often limited and the prices have gone up.</p><p>All are negative earth and all take current to the field windings. If you leave the 'ignition' on with the alternator powered up then that will drain the battery in a few hours. If you lack any electrical skills and do not have access to a multi meter then the best I can suggest is that you charge your battery, take off the wire which goes to the field winding on the alternator (that will be the smaller of the two) and then just flash the wire against the terminal. If there is a spark then current is being taken and that is what is draining the battery. If I have understood correctly then this did not happen originally and if that is the case then something has changed. Assuming that what is being discussed is one the 'proper' alternators then I do not understand why it is positive earth. It must be a nightmare to install it so that it is not shorting out as some stage.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 123814, member: 456"] There is some misunderstanding about Kubota alternators. Some people refer to Kubota alternators because they were taken off, or supplied for, a Kubota engine. As Peter writes above the small pancake ones used on some of those engines might indeed be manufactured by Kubota but I have never fitted or used one of those. I am not a fan of permanent magnet types. The one which Bill has was an Iskra as fitted to many of the smaller Citroen cars. They are very robust and can produce up to 30 amps. I then fitted a Nippon Denso alternator for Peter, These are slightly smaller in diameter when compared to the Iskra and slightly longer. These can produce 40 amps and are also very robust. Their big advantage is that the regulator is built into the alternator itself. All the early ones, perhaps 70 or 80 were the Iskra ones and the last few have been either the Nippon Denso or Densos. The Densos might be copies of the Nippon Denso ones (they look the same) and are cheaper. However, they have been 'discovered' by the kit car builders and supplies are often limited and the prices have gone up. All are negative earth and all take current to the field windings. If you leave the 'ignition' on with the alternator powered up then that will drain the battery in a few hours. If you lack any electrical skills and do not have access to a multi meter then the best I can suggest is that you charge your battery, take off the wire which goes to the field winding on the alternator (that will be the smaller of the two) and then just flash the wire against the terminal. If there is a spark then current is being taken and that is what is draining the battery. If I have understood correctly then this did not happen originally and if that is the case then something has changed. Assuming that what is being discussed is one the 'proper' alternators then I do not understand why it is positive earth. It must be a nightmare to install it so that it is not shorting out as some stage. [/QUOTE]
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Flat Battery Again
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