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Helpful ReplyHot!Alternator issue

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MG_MR2
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2018/11/21 16:54:46 (permalink)
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Alternator issue

Hi everyone,

I had my car off the road for some time doing maintenance, updating, tidying up which included installing a new alternator (old one died).

Anyone who knows 100A alternators for MR2s knows how difficult they are to find and as my old one appeared to be an aftermarket unit, rebuilding it was problematic.

After finding and buying one from the USA (there's another story in that), I installed it.

Anyway, after waiting a long time to turn the key for the first time I knew immediately something wasn't right when I had the battery/cooling fan/cat converter warning lights illuminating when the car was running.

Here are the tests I did:

1) brand new battery with good terminals/connectors

2) tested battery with multimeter and getting no charge (~11.9v running)

3) Alternator belt is good and proper tension

4) checked relevant fuses (ECU-IG, ALT sencing etc and all good)

5) unplugge the round 3 pin plug from back of alternator and battery/cooling fan warning lights go out on dash

6) Unplug the 3 pin plug from alternator and with car ignition in ON position get voltage ~10.5-12v at the 3 pins

7) As per service manual, remove cable from B terminal and attach positive of ammeter to B post and negative to cable = get a reading of 0.21A (manual stipulates under 10A is correct).

8) Put voltmeter to B terminal and ground negative terminal getting a reading of 0.54V (this is bad, should be charging volts so 12v+)

9) As per service manual, conduct a full field test (grounding terminal F) at the rear of the alternator and test voltage output. It drops slightly from aforementioned 054v (indicative that regulator is not at fault I believe)

---------------------------

Now I feel I/most others may reach the obvious/most likely conclusion but I'm after any advice from knowledgeable minds on other tests or strong opinions on what's at fault.

I look forward to some comments and a few less grey hairs at some point.

Thanks
post edited by MG_MR2 - 2018/12/04 11:17:31
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16 Replies Related Threads

    Xmr2
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    Re: Alternator issue driving me crazy.... 2018/11/29 00:25:28 (permalink)
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    When i saw this post it reminded me of when i bought my car previous owner told me that he had changed the alternator recently and the shop had trouble finding one so they ended up putting a toyota land cruiser alternator in it as it was close enough match apparently.
    I haven't checked part number tho.
    #2
    MG_MR2
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    Re: Alternator issue driving me crazy.... 2018/11/29 20:30:58 (permalink)
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    TonyMR2: thanks for the reply, don't quite appreciate the sentiment and while I could expand on some of the things you said, I won't.

    Xmr2: very interesting you say that, I was actually really hopeful of finding information like that but from all my research I never found a conclusive "an alternator from XXXXX will fit and work in an MR2" and I simply didn't have the time/ability to play around with combinations. Looking at some photos the LC unit actually doesn't look that dissimilar other than possibly changing pulleys
    #3

    TonyMR2
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    Re: Alternator issue driving me crazy.... 2018/11/29 21:34:35 (permalink)
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    MG MR2 - you don’t appreciate the info, then I will remove to ensure I don’t assist. Expand all you will, of your credentials and knowledge, continue on your path.
    post edited by TonyMR2 - 2018/11/29 22:05:38
    #4
    Xmr2
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    Re: Alternator issue driving me crazy.... 2018/11/29 22:20:40 (permalink)
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    After trying like 50 times in the dark under the car i managed to take some shots of the serial numbers of my supposedly LC altenator.. Hope this can be helpful to someone

    Attached Image(s)

    #5
    MG_MR2
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    Re: Alternator issue driving me crazy.... 2018/11/29 22:20:55 (permalink)
    +1 (1)
    It''s a forum to assist each other, your original post came across quite angry and condescending from the onset
    #6
    MG_MR2
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    Re: Alternator issue driving me crazy.... 2018/11/29 22:22:09 (permalink)
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    Legend Xmr2, I wasn't going to ask you to try because I know it's a pain, thanks very much for doing that
    #7
    Xmr2
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    Re: Alternator issue driving me crazy.... 2018/11/29 22:56:00 (permalink)
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    All good mate... Let us know if it is a LC altenator as i did quick google search and didn't find anything.
    #8
    Mrskylighter
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    Re: Alternator issue driving me crazy.... 2018/11/29 23:13:29 (permalink)
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    Could you purchase a used known working alternator from one of the MR2 wreckers in the country? Then either fit it as is or have it serviced/refreshed by auto sparky.

    1989 AW11 Gen3 3sgte
    #9
    MG_MR2
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    Re: Alternator issue driving me crazy.... 2018/11/30 00:12:48 (permalink)
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    Yeah that's an option, the ones I have are oem cores I believe so I'm planning on having them bench tested and rebuilt if need be.

    Xmr2 - does appear it's LC mate. Punch 'ATG312 alternator' in Google. That A-14 number which is then covered by 'void if removed' sticker (funnily enough) would confirm it. I think it's pretty interesting because in all my research/googling, I haven't seen anyone write about using different alternator which I found strange because that's pretty common in older cars with hard to replace items
    #10
    92 Hard Top
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    Re: Alternator issue driving me crazy.... 2018/11/30 11:22:42 (permalink)
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    Just buy this It fit perfect. Swap pullies, Which a Auto Electrician shop can do. Cost me nothing last time I did it. Your problem solved.
    Alternator Code Alt00255.
    Comes of a land cruiser 90-04 1hz, 1hdt, 4.2ltr diesel
    110 amp.
     
     
    #11
    Xmr2
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    Re: Alternator issue driving me crazy.... 2018/11/30 12:40:22 (permalink)
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    This is great news for anyone looking to change their altenator...and in my case i can report it works like charm.
    #12
    MG_MR2
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    Re: Alternator issue driving me crazy.... 2018/11/30 20:50:33 (permalink)
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    92 Hard Top: that does sound like good option. I'm away at the moment so hard to look into it but I'll see if you can confirm this:

    So the mounting bracket is the right size? & the pivot hole will take the mr2 adjustment bolt?

    I understand the pulley will have to be changed but is the shaft diameter correct for MR2 pulley?

    Is the B terminal (the thread that sticks out of the alternator from the regulator) the correct size for the mr2 fitting?

    I see the LC unit has an oval plug, is that plug and play with the mr2 harness? (I have round plug obviously but have an oval plug adapter)

    Thanks
    #13
    92 Hard Top
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    Re: Alternator issue driving me crazy.... 2018/12/01 21:07:28 (permalink)
    +1 (1)
    MG_MR2
    92 Hard Top: that does sound like good option. I'm away at the moment so hard to look into it but I'll see if you can confirm this:

    So the mounting bracket is the right size? & the pivot hole will take the mr2 adjustment bolt?

    I understand the pulley will have to be changed but is the shaft diameter correct for MR2 pulley?

    Is the B terminal (the thread that sticks out of the alternator from the regulator) the correct size for the mr2 fitting?

    I see the LC unit has an oval plug, is that plug and play with the mr2 harness? (I have round plug obviously but have an oval plug adapter)

    Thanks

    Yes they are, Auto  Electricians don't want you to know this. So they can charge you more. Because you Said JDM MR2.
    #14
    Dudeman
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    Re: Alternator issue driving me crazy.... 2018/12/01 23:12:48 (permalink)
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    Can one of you guys explain this in one post in a basic way as possible so numpties like me (who have alternator dramas) can understand what the solution is please?

    .
    .
     
           
    #15
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