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Thread: D2 Electric Starter Selenoid - Advice Needed

  1. #1
    Join Date
    Mar 2012
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    Central NY
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    Default D2 Electric Starter Selenoid - Advice Needed

    My D2 has a 24V electric start on the main diesel. It quit the other day, staying on when the solenoid burned up in the ON position - not good. Taking it off, someone had put on a plain old 12V universal auto solenoid, so it is no wonder it eventually burned up.

    What amperage solenoid would I need to prevent this happening again? I found this one at NAPA

    https://www.napaonline.com/en/p/ECHST88

    Think that will work, or do I need something heavier duty?

  2. #2
    Join Date
    Apr 2012
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    Moose Lake, MN, USA
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    Quote Originally Posted by rhartwick View Post
    My D2 has a 24V electric start on the main diesel. It quit the other day, staying on when the solenoid burned up in the ON position - not good. Taking it off, someone had put on a plain old 12V universal auto solenoid, so it is no wonder it eventually burned up.

    What amperage solenoid would I need to prevent this happening again? I found this one at NAPA

    https://www.napaonline.com/en/p/ECHST88

    Think that will work, or do I need something heavier duty?
    I picked up what seems to be a quality 200 amp solenoid on line for $70.00 or so a few months ago. Not sure the name but something along the lines of Energizer or close. No issues with it to date.
    1937 Cat #11 tandem auto patrol,diesel, w/plow and wing, 6K506SP, 1937 RD 4 Ag Crawler RD5356, 1939 Cat 22 2F5429, 1952 Model 212 Grader 9T03427, 1953 2U D8 Dozer 2U20751, 1961 922A Rubber Tired Loader, 59A812, LeTouneau LS Cable Scraper, Cat/Lincoln 600 AMP Dual Welder, DW-21 Cat Scraper, DW-10 dump wagon/water wagon

  3. #3
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
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    15,309

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    You need a heavy duty solenoid like this...
    https://www.ebay.com/itm/NEW-24-VOLT....c100008.m2219

    Try again, picture doesn't match description..
    You need a 7H6700=1119775=1119751=1119870 solenoid switch.

    This one....
    https://smile.amazon.com/dp/B013TCIQ...aa_scomp_srdg2
    Last edited by Old Magnet; 04-07-2020 at 09:29 AM.

  4. #4
    Join Date
    Nov 2006
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    Faunsdale, AL USA
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    I’ve only had one starter solenoid actually “burn” but had plenty get the contacts stuck. That usually happens when the batteries are close to dead. In that situation, the contacts are closed longer and the starter may pull more amps than normal, not sure about that, but the net result is they are very prone to weld.

    Those eBay series/parallel switches are built for that duty and should work fine for your needs. There will be a couple extra small terminals on the unit for creating the “parallel” circuit when the main contacts are open, but you can just ignore them unless you want to actually operate with a 12 volt charging system. The series/parallel electrical system was an interim design between the old 24 volt on everything and the newer 12 volt on everything designs. At the expense of some complexity in wiring and cables, the series/parallel system allowed the best of both worlds.
    D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time

  5. #5
    Join Date
    Mar 2012
    Location
    Central NY
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    Thanks Old Magnet and others for the help. I've attached photos showing the old 12V car solenoid the PO had put on it, vs. the new 1000A one I found on Amazon. It is amazing the old one didn't burn up the first time it was used. The mounting was all set up for the larger solenoid and it fit right in. She starts up perfectly now, without any smoke. http://www.acmoc.org/bb/images/smilies/biggrin.png
    Attached Images Attached Images

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