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General Chat (Vincent Related)
Faulty Alternator or Regulator
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<blockquote data-quote="Pete Appleton" data-source="post: 127013" data-attributes="member: 145"><p>The regulator has four diodes in it. As above, they are a one way gate so we need to carry out eight tests to see if they are all working.</p><p></p><p>I test a lot of these and if one diode fails everything will appear to charge but give insufficient current - Sound familiar?</p><p></p><p>Because of the input impedance of a multimeter they are not much good for this sort of work. I much prefer Amps that you can see. The first job is to construct a simple test light circuit. I would use a 12V battery and a 5W rear lamp bulb in some sort of bulb holder. See the picture below. Note that I haven't included a fuse in the line, you probably should. Certainly don't leave it connected up unattended.</p><p>[ATTACH=full]37096[/ATTACH]</p><p>I am assuming that your regulator has a red wire, a black wire and two wires of the same colour, I am going to say that they will be yellow but they could be something else. With the regulator removed we need to check...</p><p></p><p>Red wire on Black test point, First Yellow wire on red test point - Bulb Lights</p><p>Red wire on Black test point, Second yellow wire on red test point - Bulb lights</p><p>Red wire on Red test point, First yellow wire on black test point - Bulb should not light</p><p>Red wire on Red test point, Second yellow wire on black test point - Bulb should not light<span style="color: rgb(251, 160, 38)"> (edited)</span></p><p></p><p>Black wire on Red test point, first yellow wire on Black test point - Bulb should light</p><p>Black wire on Red Test point, second yellow wire on Black test point - Bulb should light</p><p>Black wire on Black test point, first yellow wire on Red test point - bulb should not light</p><p>Black wire on Black test point, second yellow wire on Red test point - Bulb should not light.</p><p></p><p>If all of these tests come out ok then I would reconnect everything back on the bike but use the bulb and bulb holder alone across the red and black leads to ensure that there is a good path to the battery. There is often enough to work a Volt meter but a dodgy connection will not light a bulb.</p></blockquote><p></p>
[QUOTE="Pete Appleton, post: 127013, member: 145"] The regulator has four diodes in it. As above, they are a one way gate so we need to carry out eight tests to see if they are all working. I test a lot of these and if one diode fails everything will appear to charge but give insufficient current - Sound familiar? Because of the input impedance of a multimeter they are not much good for this sort of work. I much prefer Amps that you can see. The first job is to construct a simple test light circuit. I would use a 12V battery and a 5W rear lamp bulb in some sort of bulb holder. See the picture below. Note that I haven't included a fuse in the line, you probably should. Certainly don't leave it connected up unattended. [ATTACH type="full" width="467px" alt="Test Lamp.png"]37096[/ATTACH] I am assuming that your regulator has a red wire, a black wire and two wires of the same colour, I am going to say that they will be yellow but they could be something else. With the regulator removed we need to check... Red wire on Black test point, First Yellow wire on red test point - Bulb Lights Red wire on Black test point, Second yellow wire on red test point - Bulb lights Red wire on Red test point, First yellow wire on black test point - Bulb should not light Red wire on Red test point, Second yellow wire on black test point - Bulb should not light[COLOR=rgb(251, 160, 38)] (edited)[/COLOR] Black wire on Red test point, first yellow wire on Black test point - Bulb should light Black wire on Red Test point, second yellow wire on Black test point - Bulb should light Black wire on Black test point, first yellow wire on Red test point - bulb should not light Black wire on Black test point, second yellow wire on Red test point - Bulb should not light. If all of these tests come out ok then I would reconnect everything back on the bike but use the bulb and bulb holder alone across the red and black leads to ensure that there is a good path to the battery. There is often enough to work a Volt meter but a dodgy connection will not light a bulb. [/QUOTE]
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Faulty Alternator or Regulator
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