Changing alternator

Discussion in 'Mech Tech' started by ukrobotman, Mar 19, 2015.

  1. i might have to replace my alternator. How practical is it to do without removing the engine. Mines a 1979 with a 1600 twin port
    Steve
     
  2. Know it's not the answer you want, but much easier to drop the engine. You only have to lower it.
     
  3. What's actually wrong with the alternator? You may be able to replace the brushes and/or regulator with it in the van.
     
  4. This ^^^^^.
    You CAN change the whole thing in situ but it'll take twice as long ad is a right PITA.
    A friend in the trade reckons half the alternators he gets in on exchange didn't need to be removed, most common faults are brushes, diode/regulator packs, poor/corroded connections and with VW's particularly the dash bulb!
     
  5. At the moment I just get the light on the dash when engine is running. I need to check it with a meter when it's running. If it's not working properly then I was planning to replace it. How practical is it to change the brushes in situ?
    Where are the diods and are they easy to replace
     
  6. Baysearcher

    Baysearcher [secret moderator]

    I swapped out my scoobty alternator the morning of my ferry and it turned out to be that pesky bulb...
     
  7. Assuming the fan belt is still attached...............
    The diode pack and brushes could be a ten minute job or a lot longer depends on the make / type of alternator.
    It'll be clearer once you have a look.
     
  8. davidoft

    davidoft Sponsor

    its easy, a bit fiddly but easy 20 mins on a dynamo, 5 on an alternator, depends on which alternator , yours may be internal or externally regulated
     
  9. This is it
    [​IMG]
     
  10. Are you sure its the alternator and not just the regulator?
     
  11. No idea, I'm in the process of removing the alternator without dropping the engine !
    We checked the output from the alternator and it was low so thought it best to replace it.
    Where is the regulator ?
     
  12. Zed

    Zed Gradually getting grumpier

    Does your dash light light up with ignition on but engine not running?
     
  13. Lights up with ignition and stays on
     
  14. Alternator is now out, I've taken the top section , brushes look ok, no idea about the regulator . How do you test it or do you just replace the entire alternator
     
  15. I have a type 4 2.0 litre and the regulator is external and located on the right hand side of the firewall, not sure if yours is internal and would come with one fitted if a new unit. I would fit a new alternator and check running output, I have had 2 new faulty regulators and have now sourced a original Bosch one which so far is ok.
     
  16. Follow the yellow wire labelled "field". It should go to the external regulator.
     

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