alternator charging issues
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  1. #1
    Administrator Darren West's Avatar
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    alternator charging issues

    i have just fitted a 21 circuit wiring loom to my truck
    there is a wire labeled up alternator excitor so i connected it directly to the alt spade that i used to have a cable connected to
    and the alt charges fine but the wire back feeds the fuse box as it stays live once the engine is running
    this in turn keeps the engine running even once the ignition is turned off
    if i pull the wire then the engine dies

    so i put a 21w 12v lamp inline next to the alt and it works perfectly ?

    can some one explain in idiot terms why this is so
    thanks

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    thought you were a sparky!!!!!!!!
    modern alternators dont need an excitor they will charge by revving and the light acts as an excitor
    at least dick turpin had the decency to wear a mask!

  4. #3
    Administrator Darren West's Avatar
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    it does need the wire as with out it then it don't charge at all

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    it will at about 900 revs but it is better with a bulb
    at least dick turpin had the decency to wear a mask!

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    robo1 is offline
    You can get round this by putting a diode on the live.

    Bob

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    Official RnS Addict MikeS's Avatar
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    Quote Originally Posted by robo1 View Post
    You can get round this by putting a diode on the live.

    Bob
    Mine came from Street and Performance with the diode, so it was either warning light or diode. Check their web site as I seem to remember that they have a wiring diagram on the site
    Money talks; unfortunately mine just says "goodbye"

  9. #7
    Gym Junkie chrisvs's Avatar
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    I think the wire should go to a warning bulb and then a wire goes from the other terminal on the warning lamp to the terminal on the alternator.
    Paradise is full of idiots who believe it exists - Georges Wolinski
    I Think Therefore I Am - René Descartes

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    sounds like it could be over charging.was it ok before you fitted new alternator ?

  11. #9
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    Quote Originally Posted by chrisvs View Post
    I think the wire should go to a warning bulb and then a wire goes from the other terminal on the warning lamp to the terminal on the alternator.
    I agree
    It's only funny till someone gets hurt..........then it's friggin' hilarious

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