Results 1 to 7 of 7

Thread: Stupid Question (Alternator)

  1. #1
    Join Date
    May 2008
    Location
    Romsey, Victoria,
    Posts
    90
    Total Downloaded
    0

    Stupid Question (Alternator)

    Being that I've spent the last six months rebuilding my engine, I now can't remember, and can't find info on which terminal on the Marelli Alternator to attach the smaller wire ie to the D+ or the W terminal

    Any one know where there is a pic or can tell me from their own car which terminal to use?

    I had hooked the small wire up to the D+ terminal but it does not seem to be charging? The Alternator is barely a year old.

    Many Thanks
    Jeff

  2. #2
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
    Posts
    26,497
    Total Downloaded
    0
    d is for Diode, its where the tacho take out comes from.

    W is for Wont charge Without Wire here
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  3. #3
    p38arover's Avatar
    p38arover is offline Major part of the heart and soul of AULRO.com
    Administrator
    I'm here to help you!
    Gold Subscriber
    Join Date
    Jan 1970
    Location
    Western Sydney
    Posts
    30,706
    Total Downloaded
    1.63 MB
    Quote Originally Posted by Blknight.aus View Post
    d is for Diode, its where the tacho take out comes from.

    W is for Wont charge Without Wire here
    On most alternators, the W terminal is for the tachometer. I don't think it's used on a P38A (I should go and look at mine but that would mean getting dressed....)

    ...... I had a look but because the LPG injector bank is mounted right behind the alternator, I can't get the cover off to see where the wires go..

    According to RAVE, the Brown/Yellow wire goes to the D+ terminal. The W terminal is not shown in the wiring diagram
    Attached Images Attached Images
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  4. #4
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
    Posts
    26,497
    Total Downloaded
    0
    just looked at the wifes one again... (Im in the middle of sorting out the electrics for the camping trip tomorrow, the winch, the multi battery bodge, the power inlet for solar and a few little things I found earlier)

    W has a wire on it (cant make out the colour for the grease
    D has a wire that should be on it but isnt because of a snapped terminal,

    the tachos not working but the alternator is charging correctly....

    more investigation required......

    According to RAVE for the disco
    B should be a big heavy sucker for the main charge
    D should be brown with a yellow trace and is the excite/regulation line (which oddly on the next page of RAVE looks like its transistor controlled, I thought the merillies were internally regualted)
    and W

    should be White with Gray trace.

    I now have NO idea why the wifes alternator is charging the batteries and not running the tacho...
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  5. #5
    Join Date
    May 2008
    Location
    Romsey, Victoria,
    Posts
    90
    Total Downloaded
    0
    Thanks Ron,
    There is no third wire on mine so the W terminal must be unused.

    The tacho is working as I was starting the "running In" process today.

    Just when I got home the battery was pretty flat.

    Ceers for now

    Jeff

  6. #6
    Join Date
    Apr 2009
    Location
    Crafers West South Australia
    Posts
    11,732
    Total Downloaded
    0
    By the P38 the tacho must finally work off the engine electrics like normal cars. The important wire for charging is the brown/yellow wire off the D+ terminal. This should light up the dash warning lamp for the charging circuit when stopped, ign on.

  7. #7
    Join Date
    May 2008
    Location
    Romsey, Victoria,
    Posts
    90
    Total Downloaded
    0
    Battery was knackered from sitting on a trickle charger for the last six months.

    The wire in question has a little guide on the side so it can only fit on th D+ terminal

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Search AULRO.com ONLY!
Search All the Web!