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Thread: MEP-002a and MEP-003a DC Charging System Test

  1. #1
    Blind squirrel rehabiltator Speddmon's Avatar
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    Default MEP-002a and MEP-003a DC Charging System Test

    Testing the DC voltage regulator in 5 easy steps

    Step 1

    With the set OFF, measure DC Voltage at the regulator wire that is marked with the red band. Should be around 24 to 24.5 volts DC...Is it??

    Step 2

    If so, DO NOT disconnect anything and start the generator. Now measure for DC Voltage at the regulator red banded wire again. This time it should be 26 to 28 volts DC give or take (in reality anything higher than you read with the set off will charge the batteries)...Is it?? If it is proceed to Step 3, If it is not skip to Step 5.

    Step 3

    If it is, measure the DC Voltage at the batteries positive and negative terminals. This voltage should be the same 26 to 28 Volts DC. If it is, then your charging system is working properly.

    Step 4

    If it is not, check the fuse located right above the oil filter canister; if it is bad replace it and test the voltage at the batteries again. If the voltage is now reading 26 to 28 volts everything is good.

    Step 5

    If you do not have 26 to 28 volts at the red marked wire on the regulator, with the set still running measure AC Voltage at the 2 leads coming from the stator under the blower wheel. This voltage should be around 33 volts AC +/-....is it??

    If it is, then your regulator is not working. If it is not then your stator is possibly bad.

    That's the jist of it, the charging system on these things is pretty straight forward
    Quote Originally Posted by Recovry4x4 View Post
    That's why I knew the answer and you didn't. I read the kindling.
    He is "anti-doghead".

    Even a blind squirrel finds an acorn every now and then!



    1970 M35A2 "The Stone Wagon" SOLD
    1985 M1028/M1031 w/700R4 "Road Oiler"
    MEP-003a 3000 hrs
    MEP-003a 1500 hrs
    1964 Case 530CK "Construction King" Backhoe/loader "Yard Oiler"

    MEP-002a & MEP-003a Spin-on oil filter kits are still 4 sale in the classified section

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    Colonel LuckyDog's Avatar
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    Default

    Can I put this into the Wiki for ya?
    M101A1: 1962 Jeta Inc "Humpty Dumpty"
    MEP-002A: 1984 Libby Welding Co "Genny"

    "Luke, Use the Wiki" Think StarWars. MEP 002A and 003A

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    Guyfang (01-17-2017)

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    Blind squirrel rehabiltator Speddmon's Avatar
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    If you want to put it in, that would be good. I made this thread a sticky so hopefully people might actually read it before the start asking about how to test their charging system
    Quote Originally Posted by Recovry4x4 View Post
    That's why I knew the answer and you didn't. I read the kindling.
    He is "anti-doghead".

    Even a blind squirrel finds an acorn every now and then!



    1970 M35A2 "The Stone Wagon" SOLD
    1985 M1028/M1031 w/700R4 "Road Oiler"
    MEP-003a 3000 hrs
    MEP-003a 1500 hrs
    1964 Case 530CK "Construction King" Backhoe/loader "Yard Oiler"

    MEP-002a & MEP-003a Spin-on oil filter kits are still 4 sale in the classified section

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    Guyfang (01-17-2017)

  7. #4
    Colonel
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    what about when you get over 30 volts

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    Blind squirrel rehabiltator Speddmon's Avatar
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    over 30 volts DC...your regulator is bad
    Quote Originally Posted by Recovry4x4 View Post
    That's why I knew the answer and you didn't. I read the kindling.
    He is "anti-doghead".

    Even a blind squirrel finds an acorn every now and then!



    1970 M35A2 "The Stone Wagon" SOLD
    1985 M1028/M1031 w/700R4 "Road Oiler"
    MEP-003a 3000 hrs
    MEP-003a 1500 hrs
    1964 Case 530CK "Construction King" Backhoe/loader "Yard Oiler"

    MEP-002a & MEP-003a Spin-on oil filter kits are still 4 sale in the classified section

  9. The Following User Says Thank You to Speddmon For This Useful Post:

    Guyfang (07-04-2017)

  10. #6
    Colonel
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    **** it that's what I was afraid of

  11. #7
    Colonel
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    Where the best place to buy one?

  12. #8
    Blind squirrel rehabiltator Speddmon's Avatar
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    A member on here...Storeman might have some used ones for sale. The last time I saw new ones on the internet was at Erics Military Surplus.

    Also maybe used ones from Delks Army Navy in Asheboro SC.
    Quote Originally Posted by Recovry4x4 View Post
    That's why I knew the answer and you didn't. I read the kindling.
    He is "anti-doghead".

    Even a blind squirrel finds an acorn every now and then!



    1970 M35A2 "The Stone Wagon" SOLD
    1985 M1028/M1031 w/700R4 "Road Oiler"
    MEP-003a 3000 hrs
    MEP-003a 1500 hrs
    1964 Case 530CK "Construction King" Backhoe/loader "Yard Oiler"

    MEP-002a & MEP-003a Spin-on oil filter kits are still 4 sale in the classified section

  13. The Following 2 Users Say Thank You to Speddmon For This Useful Post:

    steelandcanvas (11-05-2013), storeman (11-06-2013)

  14. #9
    4 Star General storeman's Avatar
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    Scratch me. I don't have any more DCVRs. Thanks Speddmon for remembering me.
    Jerry
    MEP-003A
    MEP-002A
    M101A3
    Too much welding equipment to list.
    jerry@queenscreek.com

  15. #10
    Colonel
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    I found my last dcvr's on ebay-149.00.
    David
    002 (x4)
    003 (x2)
    '06 Cummins 5.9 (came wrapped in a Dodge 2500)
    'botas-L225, L3130, L3901

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