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Thread: Help with alternator problem.... And what's this for?

  1. 09-12-2014, 11:14 AM #1
    PMNorris
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    Help with alternator problem.... And what's this for?

    Hi,
    I've just finished rebuilding a 79SC engine and fitting it to my 70T. The engine runs well, apart from a flat spot that i need to sort, but i have a problem with the alternator. I had the alternator rebuilt. Its been tested and works fine apparently, but its not charging. I suspect that i have a wiring problem. The engine was originally a CSI sporto engine and now its running PMO's with a manual box. Here's the questions.....

    1: wiring. Its not clear to me where the wires from the alternator connect to on the 14 pin connector. According to this, i should have connections to pins 2, 11 and 14 on the 14 pin connector.
    - Pin 2 is yellow on my car which suggests starter to me. There is no connection from B+ on the alternator to pin 2, but there is to pin 14. Should i have a connection to pin 2 from B+
    - pin 11 is connected to +61 on the alternator (blue cable)
    - where does the black cable on the alternator connect to?

    http://www.pelicanparts.com/MotorCit...fications.html
    http://forums.pelicanparts.com/porsc...lp-needed.html

    Here's a photo of the back of the alternator.
    Name: image.jpg Views: 181 Size: 66.7 KB


    2: Second question which could be relevant. As stated above, the engine was a 79 cdi SC engine. There are a few spare connections. I didn't have the donor car so i dont know where it went, but it would appear to be able to plug in the 3 pin plug in the photo to the connections in the 70T engine bay. However, these are already being used. Any ideas what these are?

    Name: image.jpg Views: 178 Size: 99.6 KB

    I'm struggling to read to wiring diagrams as whilst they're logical, they don't show where on the car the relevant connections are.
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  2. 09-13-2014, 11:43 PM #2
    PMNorris
    PMNorris is offline
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    Looks like my problem could be the blue wire to the voltage regulator. Plenty of ideas for me to test here:

    http://forums.pelicanparts.com/porsc...nt-work-3.html
    http://forums.pelicanparts.com/porsc...t-problem.html
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  3. 09-14-2014, 12:34 PM #3
    MTemp
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    The three pin plug fits into the bottom of the voltage regulator - the small rectangular silver-coloured dome top box next to your cdi 'Ignition' box. Without this connected your alternator won't work for sure

    Mick
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