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2024 CT. MILITARY VEHICLE SHOW AND FLEA MARKET- JUNE 15,2024
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willysmjeeps.com :: View topic - M38 Voltage Regulator
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M38 Voltage Regulator
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Naugha
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Joined: Apr 01, 2020
Posts: 409
Location: Ocala, Florida

PostPosted: Fri Nov 19, 2021 1:15 pm    Post subject: Reply with quote

VBU- 4002UT. Yeah, shot in the dark. This VR thing is going to take some sober effort. Probably no shortcuts.

I should get off my backside and go work on some stuff I can do.
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Don Alvarez
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Ryan_Miller
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PostPosted: Fri Nov 19, 2021 1:29 pm    Post subject: Reply with quote

I guess I missed that older post on Pete!

The eBay VR looks interesting, sure would be nice if they could test those and say if working or not. NOS with rusty feet makes one wonder if it was kept in a moist environment. I know they are supposed to be water proof, but do you think the rubber seals are still good from 60+ years - maybe.
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Ryan Miller
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RonD2
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PostPosted: Fri Nov 19, 2021 1:37 pm    Post subject: Reply with quote

VBU-4402UT. Yeah, big shot in the dark. Besides not having the correct amp rating, I just noticed that the connectors have entirely wrong pin-outs too.
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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Naugha
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PostPosted: Fri Nov 19, 2021 6:03 pm    Post subject: Reply with quote

“The eBay VR looks interesting, sure would be nice if ...” Ryan

Yeah, the no testing, no warranty, limited (old) parts availability and few folks who know how to fix ‘em makes for a VR challenge.

I think I will fix the wires, paint the box, color the raised letters red, dress the points with a Swiss #6 file (is that found on a Swiss Army knife Smile ), locate the resistors, and start looking around for an old Korean War motorpool vet.
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Don Alvarez
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4x4M38
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Joined: May 30, 2014
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Location: Texas Hill Country

PostPosted: Sun Nov 21, 2021 7:37 am    Post subject: Reply with quote

You could always call Midwest Military and talk to John.

He has always been available to talk about issues.
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Brian
1950 M38
MC11481
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Naugha
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PostPosted: Sun Nov 21, 2021 11:46 am    Post subject: Reply with quote

I will give John a call next week.... also found a place that offers an interesting twist, new to me at least. Repairs can be done to old VR’s or they can install an electronic VR inside the existing ‘bread box’. Wiring harness and gauge changes would be needed. I am waiting on an email reply from PP.com.

https://www.precision-pwr.com/voltage-regulator-and-generator-cut
“This conversion can be achieved with 100% original exterior appearance.”

One is tempted to get a M38 Auto-lite VR housing and stick a modern VR inside. You would of course need a very, very small sticker on the bottom side of the faux unit explaining you had no idea how to fix the original VR so you spent a lot of money to put a new unit inside an old box.

Much is said in the threads about sacrificing some originality for reliability and drivability. I don’t want a ‘Trailer Queen’ but was trying to stay as original as possible. The old school VR may be a component that will often spoil the fun with few options for repair/replacement. Maybe I should ‘get smart’ on this issue. We shall see.
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Don Alvarez
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RonD2
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PostPosted: Sun Nov 21, 2021 3:43 pm    Post subject: Reply with quote

https://www.eriksmilitarysurplus.com/vore25am28vo.html
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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Naugha
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PostPosted: Mon Nov 22, 2021 5:39 am    Post subject: Reply with quote

Electronic VR’s.
Always good to have options.

There are many of the old breadbox mechanical VR’s out there for sale that would fit my M38 but they are all untested take offs. Most all of the other rare stuff (carbs/starters/generator/ fuel pumps/ wiring harness) can be bought rebuilt with a warranty. Many repos for almost all body parts/ hardware.

Could a working original M38 VR be the most difficult M38 part to find in proven working condition?
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Don Alvarez
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RonD2
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PostPosted: Mon Nov 22, 2021 8:57 am    Post subject: Reply with quote

Naugha wrote:
Could a working original M38 VR be the most difficult M38 part to find in proven working condition?

And pound for pound perhaps also the most expensive.

I've heard it said in this hobby not to add the receipts (or tell your spouse) what you spent, because you don't really want to know that (1) you're well past the point of no return, and (2) you have way more in it than you could ever sell it for.

I've been thinking for some time now that the fastest, easiest, and cheapest way to get a working 24V system is to buy it already attached to a restored M38.
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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wesk
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PostPosted: Mon Nov 22, 2021 11:14 am    Post subject: Reply with quote

It's time to put this poor horse to sleep. Traditionally in auto maintenance electrical parts have always had serious warranty restrictions due to their being so easy to damage. That's why all warranties are null and void anytime the tamper seals are broken. Automotive electrical repair and rebuild shops are usually very reliable and the operators have a very thorough understanding of the operating principles. So let's simplify the acquisition of used military 24V equipment. You rarely find 50 year old electrical parts still new in the box and seldom with any kind of warranty. So try to get used the same processes the rest of us have learned to deal with by simply taking the two primary operating parts you want tested to any "Worth a Salt" electrical repair shop and let them do their job. They will bench the gen/reg pair and tell you very quickly what if anything is wrong with them and how to repair and the cost of repair. They have the same, if not even better access to all electrical component service data that we have. If you lack experience or the required skills to repair something then you must take the path we all do and either hire the pro or learn the necessary skills to do the work yourself.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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Naugha
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PostPosted: Mon Nov 22, 2021 6:19 pm    Post subject: Reply with quote

“It's time to put this poor horse to sleep..... If you lack experience or the required skills to repair something then you must take the path we all do and either hire the pro or learn the necessary skills to do the work yourself.
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Wes K

Well said. I know my limitations and am willing to hire that pro.
What is his name ?
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Don Alvarez
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wesk
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PostPosted: Mon Nov 22, 2021 11:18 pm    Post subject: Reply with quote

If you read carefully you will see that the name is "Automotive Electrical Repair". Some shops have technicians with more experience than others. You simply ply the yellow pages until you locate a shop with adequate experience. Up here in northwestern Wisconsin I have 4 shops with a 40 mile circle of me that can all handle this work. Keep in mind my nearest neighbor is a half mile away from me.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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Naugha
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PostPosted: Tue Dec 21, 2021 3:00 pm    Post subject: VBC-4002UT Reply with quote

I put the VBC-4004UT on the 'Do Later' shelf and bought this VBC-4002UT.
No guarantee on electronics but the supplier has a very good rep.
We shall see...... moving right along...... one step at a time.

“Thanks for your interest. This regulator is checked carefully by my technician , who is an extremely very experienced electrician with the M series jeeps and trucks. After having checked the regulator is fine , he continues to operate the regulator for about one and a half hours to be sure is working properly and loads correctly.” Steve in Athens




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Don Alvarez
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Last edited by Naugha on Tue Dec 21, 2021 3:11 pm; edited 1 time in total
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RonD2
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PostPosted: Tue Dec 21, 2021 3:08 pm    Post subject: Reply with quote

Nice Don!

Tested known good? With a warranty?
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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Naugha
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PostPosted: Tue Dec 21, 2021 3:36 pm    Post subject: Reply with quote

Hi Ron.

I added some more info above. We shall see.
I do plan to rebuild the VBC-4004UT at some point.

Been spending more time with body work.... cant decide how smooth things should look..... thinking a M38 should have a few bumps, right? Then there is the whole electrical thing & gauges. Smile

Merry Christmas to all.
Don
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