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New to Guzzis and V65SP elect. problem

Discussion in 'Small Block' started by Mervk, Feb 11, 2018.

  1. Mervk

    Mervk Just got it firing!

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    Hi. Glad to join this form. Have an early 80's V65SP which isn't charging. Idiot light bulb is good. Tested the diodes in the rectifier and appeared ok, however one test I found online was to put the multi-meter between the earth lead and the battery earth terminal and look for a voltage leak. Mine has a leak of a little over 2v, and supposedly that indicates a faulty rectifier. However a new rectifier changed nothing. In fact, I can disconnect every wire from it except the output wire to the battery, and still register 2.1v with the neg probe on the neg batt terminal, and the positive probe on the rectifier body. Is this normal? I have a new regulator coming as well, and resigned to getting a new alternator. Welcome all suggestions on how to determine which bit is the problem. Cheers.
     
  2. Brian UK

    Brian UK GT Reference

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    The charge warning light is on all the time?

    It is the correct size, 2.2W Bulb? If it's a lower rating it might not start charging. if it's been changed to LED, it won't work.

    With ignition off, check on he alternator the resistance between the two brushes. It should be about 4 ohms. If it's much higher, check the slip rings are clean and the brushes are making good contact. If still higher, check the resistance between the slip rings on the rotor. Again should be 4 ohms. If open circuit, you need to get the rotor rewound, or replaced.
     
  3. Mervk

    Mervk Just got it firing!

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    Thanks for replying. The charge light does not light, however the bulb is good and lights if I earth it manually at the wire from the rectifier to the regulator. I suspect the regulator may be at fault and have a new one coming. Thank you for the info on testing the alternator fields, I shall test that this afternoon. The voltage leak of 2+volts from body of both old and new rectifier has me confused. Perhaps my multi-meter is too sensitive and giving a false reading?
     
  4. Mervk

    Mervk Just got it firing!

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    My new regulator arrived today and after simply plugging it in, the charge light comes on. So I shall now refit the tank and try it to see if it charges. Thanks for your reply. You'll hear from me if it doesn't. Cheers.
     

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