1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. It's been bought to our attention that certain users are spamming new and existing users with links to their own websites. This is not permitted on VxON.
    Should you receive such a message, please report this using the 'Report' link you will find at the bottom of the message.
    Those users will then be dealt with accordingly.
  3. Use The Search Function That's what It is There For!
    The chances are that the post you are about to make has already been asked so USE the search function first! You can either search JUST this forum by clicking on the search button on the top right (under the page numbers) or click on the main search button that is on the top tool bar.
    This will save you time and stop the same duplicate posts from appearing.

  1. whitedoggrrr

    whitedoggrrr New Member

    Messages:
    6
    Likes Received:
    0
    Location:
    Norwich
    Hi ya!!!!!!
    Don't know if anyone has any experience with this........

    I've just fitted a new alternator to my Astra 1.7TD (M reg, 1995-Isuzu engine), but, it had a 'copy' alternator fitted previously & the wiring was changed to fit the old alternator (there was another wire & connector inserted between the 4 pin round plug & the copy alternator).

    Theres a 4 pin round plug with 4 wires coming out of it (thickish red wire, skinny black, yellow/red & green wires coming out of it).
    It also has a separate, thick red wire which was attached to the screw terminal marked 'B' on the old alternator.

    Thing is, I've wired it up, & it doesn't work (alternators good, & I fitted a new charge relay).
    The separate red wire doesn't go on the screw terminal, as this (I think?), is for the rev counter (which I think is the yellow/red wire??).

    Question is, which colour wire should be on the screw terminal marked 'B' & where should the 2nd (currently loose) red wire go?

    Not sure if anyone can help or if anyones had this problem before or if anyone swapped a 'copy' alternator back to the original??

    Any info/help would be greatly appreciated!
  2. TdiSte

    TdiSte Still proud to be a

    Messages:
    4,121
    Likes Received:
    2
    Location:
    North Yorkshire
    Theres supposed to be two connectors for the standard alternator, a white round one and a black square one.

    I Don't own one anymore so cant just go out and look unfortunately.
    I thought the alternators had wires with plugs on which plugged into the car near the airfilter box and the radiator, no need to attach anything yourself.

    Mind you i had a cavalier not an astra so they could have changed the set up at some point.

    The rev counter is the green wire by the way.
  3. greasemonkey

    greasemonkey VXon Frontera Monkey VxON Club Member

    Messages:
    9,866
    Likes Received:
    53
    Location:
    Bury St Edmunds Isuzu Land
    Drives:
    Frontera
    hi the Isuzu diesels have a four or three wire plug one for main feed to battery one for the dash light one for the charging relay and one for the rev pick up i don't have the rest of the info but maybe someone who has one would have a look and post it on here --the wires should be in a moulded plug so you can't fit them wrong but i am sure the biggest terminal has the thickest wire which is normally red and the down in size goes to the next one etc etc
    regards
    Steve
  4. JasonQ

    JasonQ New Member

    Messages:
    11
    Likes Received:
    0
    Location:
    Yateley, Hants
    Hi
    I encounter a few problems when I replaced my alternator (same model and year car as you) what I found out was this
    Big thick red line - Alternator Output To Battery

    The 4 pin connector:-

    Red - voltage sensing
    Black - Ignition feed (live with ignition on) used as excitation feed
    Green - Output to drive tachometer
    Yellow/Red - Charging indicator output (via the relay)

    The alternator I replaced had the original wiring loom on it which I had to swap to the new one.

    On the alternator the 4 wires came out from a single connector, the wires then ran to a round 4 pin connector mount on the front of the inner wing near the rad (wires and colours as above).

    The thick wire (alternator Output), I can't recall any markings on the alternator but it was a threaded post/connector that was isolated from the main 'body' of the alternator by a rubber grommit. This threaded post was on the back face (opposite end to the pulley), when mount in the car was towards the front of the car and certainly under the 4 pin connector.

    The BIG thick output wire routed around the back face of the alternator, there was a big black square electronic component (a suppression capacitor?) also screwed to the alternator body that the single big thick wire connected to on it way to the car's wiring loom - same place as the 4 pins (inner wing) but it's connector was a square one.

    I can't get to my car at the moment (cycle to work) but if none of the above is clear ask again and I'll take a look/photos as soon as I can (probably tonight).

    However after connecting my new alternator up it didn't work initially but 'mysteriously' started working after about 10 miles of driving - it might help to read the later posts in this thread
    http://www.vauxhallownersnetwork.co.uk/showthread.php?t=139854
  5. whitedoggrrr

    whitedoggrrr New Member

    Messages:
    6
    Likes Received:
    0
    Location:
    Norwich
    Thanks for the advice, especially that link to the other thread, the problem you had seems very similar to what's happening to mine now!

    The only other problem thats occurred (forgot to mention it as I got fed up & haven't used the car for a month or so!),

    When the alternators plugged in, I can't switch the engine off, it just keeps running even after the ignitions been turned off & the keys been taken out?

    It doesn't do it all the time, just most of the time, which makes me think knackered wire or broken wire somewhere? But, which one..........?

    Cheers!
  6. TdiSte

    TdiSte Still proud to be a

    Messages:
    4,121
    Likes Received:
    2
    Location:
    North Yorkshire
    Strange, it must be giving the fuel cut-off solenoid power then, i take it all the rest of the dash lights go off when it does this?
  7. whitedoggrrr

    whitedoggrrr New Member

    Messages:
    6
    Likes Received:
    0
    Location:
    Norwich
    The dash lights mostly go out, the ABS warning light comes on (this goes out when the ignitions turned on) & the airbag warning light flickers???? All the other lights go out, just the engine keeps running?

    Could be a case for the X-Files bloke...................
  8. whitedoggrrr

    whitedoggrrr New Member

    Messages:
    6
    Likes Received:
    0
    Location:
    Norwich
    Back......again!!!!!!
    Anyone know the location of the fuel cut-off solenoid on a 1995 Astra 1.7TD?
    I'm still having the problem of the car still running with the ignition switched off, but, I reckon it's a break/wear in the loom from the alternator, if I can trace the wires back from the fuel cut off thingy I should be able to find it!

    There seems to be some voltage coming from the alternator, with the 4 pin plug connected, the voltage is a steady 11.3 volts, but, if I take out the 4 pin connector (so just the thick, red output wire is connected to the seperate post), the voltage reads between 12.1 & 12.3 volts & voltage increases slightly as the revs increase!? Not the correct voltage, I know, but it shows somethings coming out of the alternator!

    Also, with the 4 pin round plug disconnected, the car switches off fine!?
  9. TdiSte

    TdiSte Still proud to be a

    Messages:
    4,121
    Likes Received:
    2
    Location:
    North Yorkshire
    The fuel cutoff solenoid is the rubber capped thing at the left of this picture(under the gold screw). This pic is taken of the fuelpump, aiming under the inlet manifold from the gearbox end of the engine.
    [​IMG]

    Are your alternator connectors like this?
    [​IMG]
  10. whitedoggrrr

    whitedoggrrr New Member

    Messages:
    6
    Likes Received:
    0
    Location:
    Norwich
    Yep, the connectors do look like the ones in the pic.

    Been fiddling with it tonight, haven't got a clue why, but the running after the key/ignition is turned off problem has suddenly cured itself?? Stop's fine now when you turn it off by the key!

    I've cleaned all the terminals connecting to the battery & on the alternator, also cleaned the earth lead. The voltage is now 11.8 with the round plug connected & 12.9 with the round plug disconnected & just the thick red output wire connected.

    I've been running the car on & off most of the afternoon & evening & the more I run it, the better the voltage seems to gradually get, so I'm thinking it's possibly something similar to what happened to JasonQ in the post he linked to.

    I'm gonna charge the battery up, shove a spare van battery in the boot & take it out for a blast tomorrow to see if it kills/cures it!?

Share This Page