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Thread: DMCH alternator

  1. #51
    Senior Member
    Join Date:  Nov 2013

    Location:  NYS

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    My VIN:    Formerly 10372, currently 4728

    Quote Originally Posted by DMC5180 View Post
    Rich, it's Dana not me. The covering is thermal heat protection sleeve.


    Sent from my iPhone using Tapatalk
    Sorry 'bout that, thanks for the info... !
    Restoration of VIN 4728 in progress...

  2. #52
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

    Posts:    1,154

    My VIN:    <2000

    Club(s):   (DCF)

    Duceiller wire success?

    Quote Originally Posted by DMC-81 View Post
    Thanks again Dennis. Great info on those tools. I'll have to look for them.

    I decided to just use the new connector, instead of risking damage by removing a pin. I tested the brown Duceiller wire for the S connection, and it was successful in turning off the flashing condition with the key on.

    Attachment 49210

    This is a cleaner setup in my mind, but I realize I'll have to test the voltage difference as described earlier by Ron in post 32 and 36 before I wrap it up permanently.... (It'll be a while until I can start the car again). If it fails this test, I'll connect the red wire to the alternator post.

    As far as the testing goes, I'm looking for a greater than 0.5 volt difference between the alternator and the battery at maximum alternator output.

    Question: I assume I test with the engine running at a fairly fast idle, and for:
    1) the alternator I test at the output post on the back (with the 2 groups of 6 brown wires attached), and:
    2) the "battery", I test the voltage at the brown Duceiller wire where I connected it

    Is that correct, and are there additional tips? What about lesser alternator output speeds?

    What's the downside if the voltage difference is out of spec? Edit: I found the answer to this question in Dave M's post # 31.

    Thanks,
    I was finally able to test the voltage with my new plug and the "S" wire connected to the original brown Duceiller wire. I got 14.59 volts at the alternator output terminal and 14.53 volts across the battery.

    What are your thoughts? Is that a good result?
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  3. #53
    Matt Drive Stainless's Avatar
    Join Date:  Mar 2016

    Location:  Washington D.C.

    Posts:    369

    Quote Originally Posted by DMC-81 View Post
    I was finally able to test the voltage with my new plug and the "S" wire connected to the original brown Duceiller wire. I got 14.59 volts at the alternator output terminal and 14.53 volts across the battery.

    What are your thoughts? Is that a good result?
    Sounds great!
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    Welding services also (all metals)!
    http://www.drivestainless.com

  4. #54
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

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    My VIN:    <2000

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    Quote Originally Posted by Drive Stainless View Post
    Sounds great!
    Thanks Matt. I measured it at a steady idle (after warm up). I didn't have an assistant to do it at a fast idle but I assume the voltage difference wouldn't creep up dramatically as the RPMs increase due to the built in voltage regulator. Is that a correct assumption or should I test again?
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  5. #55
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    6,363

    My VIN:    03572

    Quote Originally Posted by DMC-81 View Post
    Thanks Matt. I measured it at a steady idle (after warm up). I didn't have an assistant to do it at a fast idle but I assume the voltage difference wouldn't creep up dramatically as the RPMs increase due to the built in voltage regulator. Is that a correct assumption or should I test again?
    Your voltage is probably regulating fine. It should not climb much more than 14.6 volts. It's only when you have a lot of load and low RPM that it may fall below that value.
    Dave M vin 03572
    http://dm-eng.weebly.com/

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