Page 2 of 9 FirstFirst 1234 ... LastLast
Results 11 to 20 of 86

Thread: New Willys Jeep owner

  1. #11
    Super Moderator bmorgil's Avatar
    Join Date
    Dec 2018
    Location
    Northwestern Ohio
    Posts
    969
    gmwillys, Do you think he has a 24 volt regulator in a converted 12 volt Jeep? Was there a 12 volt M38A1? How did they get the 24 volts?

  2. #12
    Super Moderator LarrBeard's Avatar
    Join Date
    Nov 2014
    Location
    Ft. Wayne, IN
    Posts
    1,424
    Quote Originally Posted by bmorgil View Post
    gmwillys, Do you think he has a 24 volt regulator in a converted 12 volt Jeep? Was there a 12 volt M38A1? How did they get the 24 volts?
    One thing we've learned is to never say "Never".

    But, the M38A1 was a 24-volt vehicle. It used two 12-volt batteries in series to get the 24-volts. The creature we are getting a description of is kind of a giraffelephant. We have a 6-volt starter, a 12-volt battery and a generator that is charging a 12-volt battery at 17-volts.

    IF - and IF - he has a 24-volt generator driving a 12-volt regulator, it could charge that high. OR - if he still has a 24-volt system with just ONE 12-volt battery, that would explain the 17-volt charge voltage.

    I would like to see pictures of:

    A. The Generator. The original M38A1 generator can't be mistaken for anything else with the double pulleys and the cable set it used.

    B. The voltage regulator: Again, nothing else looks like an M38A1 regulator with the two aircraft-like quick disconnect connectors on the unit.

    But, as we have learned - when Bubba, Junior and Leroy go through the parts bin and whip up a contraption, it's really hard to reverse engineer it...

    Please, some pictures of the generator and regulator.

  3. #13
    Member
    Join Date
    Dec 2019
    Location
    Flagler Beach, FL
    Posts
    32
    fullsizeoutput_24cd.jpg fullsizeoutput_24bf.jpg

    The generator has "12-volt" stamped into the case (I know that means nothing) and from some research, everything says it's a 12-volt. The voltage regulator appears fairly new and I don't see an adjustment on it.

  4. #14
    Super Moderator gmwillys's Avatar
    Join Date
    Aug 2017
    Location
    Alabama
    Posts
    2,082
    I believe in the 12 volt markings as being true. You can pull the cover off of the regulator and adjust the voltage output by adjusting the contacts. The following pdf explains the procedure;

    http://www.ruiter.ca/mc/info/PDFs/1R-116.pdf

    There was not a 12 volt M38A1 from new. With the expense of the 24 volt replacement parts and the fear of the unknown, many of these parts were swapped with 12 volt equipment. Me personally, I like the 24 set ups. The parts are heavy duty, and generally work without issue unless a harness has been spliced or dry rotted. The same can be said for 6 volt systems. I like my 2A because it has retained it's 6 volt system. The components are heavier, and produces more torque for starting, but can withstand having 12 volt applied for short amounts of time if you needed to jump it off....Just don't turn on any lights, because you'll be buying bulbs.
    Last edited by gmwillys; 12-16-2019 at 12:32 PM.

  5. #15
    Super Moderator LarrBeard's Avatar
    Join Date
    Nov 2014
    Location
    Ft. Wayne, IN
    Posts
    1,424

    12-Volt M38A1

    Quote Originally Posted by DougL View Post
    fullsizeoutput_24cd.jpg fullsizeoutput_24bf.jpg

    The generator has "12-volt" stamped into the case (I know that means nothing) and from some research, everything says it's a 12-volt. The voltage regulator appears fairly new and I don't see an adjustment on it.
    I think we're starting to see what's been done to the vehicle, a major 12-volt conversion that may or may not have been done well.

    The voltage regulator is a commercial (vs. MIL-SPEC) regulator. The VBT photo is the original M38A1 regulator - obviously not what you have! We'll assume the generator is a 12-volt generator. The wires connecting to the regulator are a modified wiring harness that looks a lot like a factory harness (see the attached photo) with wires about the right color.

    As a first step, I would replace the voltage regulator. You can adjust the voltage regulator relay a bit, (you have to open it up and bend a tab on a spring) but if it's putting out 17 volts, it's beyond adjusting. I suspect a stuck voltage regulator relay (points burned and welded together).

    Here is one of the universal three-terminal (Field/Armature/Battery) regulators that fit most any of the two terminal generators:

    https://www.autozone.com/starting-ch...tor/319661_0_0

    Meter things out to be sure someone hasn't switched a wire somewhere.

    How about a picture of the passenger side of the engine bay so we can see the wiring and how it may have been modified?

    We'll figure this out.

    (Oh by the way, a properly operating 12-volt system will work just fine...).
    Attached Images Attached Images

  6. #16
    Member
    Join Date
    Dec 2019
    Location
    Flagler Beach, FL
    Posts
    32
    I installed the voltage regulator LarrBeard and after starting it, the new voltage regulator began smoking. The Arm wire melted and I probably fried the voltage regulator too. I did notice this regulator is 6-volt. Could that be the issue? Thanks.

  7. #17
    Super Moderator LarrBeard's Avatar
    Join Date
    Nov 2014
    Location
    Ft. Wayne, IN
    Posts
    1,424

    Smoking Voltage Regulator

    Quote Originally Posted by DougL View Post
    I installed the voltage regulator LarrBeard and after starting it, the new voltage regulator began smoking. The Arm wire melted and I probably fried the voltage regulator too. I did notice this regulator is 6-volt. Could that be the issue? Thanks.
    I suspect that a 6-volt regulator on a 12-volt generator is going to be fried, especially if it has actually smoked. My suspicion is that the coil on the voltage regulator relay drew way too much current and burned out. Even if that relay opened and put the control resistance in series with the field, the 6-volt resistance could not limit the field current in the 12-volt generator and after that, it was a contest as to what was going to smoke next.

    You have a generator that probably hasn't been damaged - they're tough critters - and your battery has been compromised by the 17-volt high current charge condition. In the short term, I'd try a 12-volt regulator and a new armature wire. If that settles things down, you probably should think about a new battery.

    Again, make sure the wires are hooked up to the right places.

    (I'm not going to make any smart aleck comments about letting out the magic smoke ... )

  8. #18
    Super Moderator gmwillys's Avatar
    Join Date
    Aug 2017
    Location
    Alabama
    Posts
    2,082

  9. #19
    Super Moderator LarrBeard's Avatar
    Join Date
    Nov 2014
    Location
    Ft. Wayne, IN
    Posts
    1,424

    Magic Smoke

    Quote Originally Posted by gmwillys View Post
    I

    Ahhh man. This is a tough house.

  10. #20
    Super Moderator bmorgil's Avatar
    Join Date
    Dec 2018
    Location
    Northwestern Ohio
    Posts
    969
    Quote Originally Posted by gmwillys View Post
    I laughed so hard I hurt my rib. I started laughing again and hurt my back so, I am not reading that ever again.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •