505 S1 alternator problem - not so fast
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  1. #1
    Fellow Frogger!
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    Default 505 S1 alternator problem - not so fast

    hey froggers

    so car stopped and road side assist said it was alternator, seeings as it gradually dimmed the lights at night and then engine konked out and wouldn't restart (after jump start only low voltage was being delivered to battery)

    took alternator out and brought it to a sparky - he says the alternator is ok

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    so, what are the possible issues that could have caused the breakdown, if not the alternator?

    car is a series one Pug 505 STi

    ta

    JR
    Last edited by robjer; 25th June 2011 at 11:23 PM.

  2. #2
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by robjer View Post
    hey froggers

    so car stopped and road side assist said it was alternator, seeings as it gradually dimmed the lights at night and then engine konked out and wouldn't restart (after jump start only low voltage was being delivered to battery)

    took alternator out and brought it to a sparks - he says it's ok

    so, what are the possible issues that could have caused the breakdown, if not the alternator?

    car is a series one Pug 505 STi

    ta

    JR
    Alternator wiring is about the only thing, or a massive issue in main feeds/relays to all of electrical system.

    I'm thinking a fault in the field circuit of the alternator?

  3. #3
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    hey - thanks but the spaky said the unit was ok

    so that rules out the field circuit no?

  4. #4
    COL
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    Default Regulator

    Hi Robjer

    Does your alternator have a built in regulator? If not it could be that.

    Also do you have a charge light in the dash? If so you should of noticed the light come on so maybe the light is blown. The lamp forms part of the field circiut so if its blown the alternator will not charge.

    I'm not familiar with the 505 so not exactly sure what is in the alternator circuit, these are just a couple of ideas you can try. Hope it helps a little.
    Regards Col

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  5. #5
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by robjer View Post
    hey - thanks but the spaky said the unit was ok

    so that rules out the field circuit no?
    If the alternator was tested off the car then the car wiring to the field circuit can't be tested.

    I must say it's unusual to test an alternator off the car, normally it would tested on the car to test for faults in the vehicle wiring as well as the alternator.

    You have checked the vehicle fuses of course?

  6. #6
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    yeah i was trying to save money by taking the alternator in by itself ... it has in built V regulator on it

    the car has just lapsed reg but could have it towed to auto elec i guess

    will check fuse

    when i took it out it appeared all connections were intact - except for one wire that looked like it had been permanently disconnected some time ago

    so .... sounds like i should put the unit back in the car and test the field circuit ..

  7. #7
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    Quote Originally Posted by robjer View Post
    yeah i was trying to save money by taking the alternator in by itself ... it has in built V regulator on it

    the car has just lapsed reg but could have it towed to auto elec i guess

    will check fuse

    when i took it out it appeared all connections were intact - except for one wire that looked like it had been permanently disconnected some time ago

    so .... sounds like i should put the unit back in the car and test the field circuit ..

    robjer,
    A loose/slipping belt?

  8. #8
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    RAA guy checked it on the dark and stormy night this all happened ... didn't think it was slipping

    have now checked all fuses and they are fine

    i guess i'll have to put it back into car ...

  9. #9
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    G'day Jeremy,

    I had a very similar problem the other night.

    Turned out that the 'exciter' wire for the alternator had broken.

    Maybe the wire that is not attached should be?

    If you get the alternator back in the car you could maybe call a mobile sparky to look at it.

    Cheers

    Philip

  10. #10
    owl
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    When you get the alternator back in the car, check that the 'alt' or 'charge' light comes on on the dashboard when the ignition is in the 'run' position (before you start the car). If you don't get that light coming on, then there may be no excitation voltage for the field circuit - so no alternator output. The light should go out when the car is started.

    If you do not have the dash light - check / replace the globe. If this doesn't fix the it then you have a problem somewhere else in the field circuit wiring.

    Ian
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  11. #11
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    Ian Phil and Beast

    ok that's pretty clear - unit back in the car and check dash bulb and excitation wire / field circuit

    i'll see if i can look up a diagram for the unit on line so i know which connection is which

    i'm planning to loan this car to the brother in near future so want this little issue cleared up

    thanks all

    JR

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