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1950 M38 no reading on the dash amp meter

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1950 M38 no reading on the dash amp meter

 
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radtech
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Joined: Aug 09, 2010
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PostPosted: Sun Apr 21, 2024 4:49 pm    Post subject: 1950 M38 no reading on the dash amp meter Reply with quote

The generator is charging 30 volts but no reading on the amp meter
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4x4M38
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Joined: May 30, 2014
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PostPosted: Sun Apr 21, 2024 5:04 pm    Post subject: Reply with quote

The amp meter only shows load, correct? Do you have anything turned on?

The voltmeter if you had one shows generator output continuously.

Maybe I’ve been out in the sun too long today….
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Brian
1950 M38
MC11481
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RonD2
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PostPosted: Sun Apr 21, 2024 6:47 pm    Post subject: Reply with quote

With the engine not running, turn the headlights on.
Do you see the ammeter needle jump part way to the negative side indicating the load on the batteries?
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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."
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radtech
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PostPosted: Sun Apr 21, 2024 7:50 pm    Post subject: Reply with quote

I think the armature in the meter is locked up.It doesn't move with the lights on or when running the radio gear.Is there any source for these amp meters.It is a Dec.1950 mfg and I would like to keep it original.
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radtech
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PostPosted: Sun Apr 21, 2024 8:22 pm    Post subject: Reply with quote

Found one on ebay NOS.
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G740
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PostPosted: Mon Apr 22, 2024 5:50 am    Post subject: Reply with quote

What voltage regulator are you running? Solid state or mechanical?
John
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wesk
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PostPosted: Mon Apr 22, 2024 9:33 am    Post subject: Reply with quote

You mentioned your radio gear. Most jeeps with radio gear had the larger output generators or alternators. Most conversions to these larger power output units included a switch from amp meter to voltmeter. This would be a good time to give us a accurated component assessment of your electrical system. Stock, 60 Amp or 100 Amp or civilian system.
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Wes K
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radtech
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PostPosted: Mon Apr 22, 2024 12:20 pm    Post subject: Reply with quote

Current draw is only around 8 amps in receive and 12 in transmitt.It has never affected the batteries.
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wesk
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PostPosted: Mon Apr 22, 2024 12:36 pm    Post subject: Reply with quote

So, is your electrical system completely stock and original? Including the voltage regulator? The Army introduced a transistorize voltage regulator around 1959. Also a Delco generator and regulatyor were optional. When you first start the jeep does the amp meter show a positive charge then taper off to the middle neutral position?
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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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RonD2
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PostPosted: Mon Apr 22, 2024 4:31 pm    Post subject: Reply with quote

radtech wrote:
I think the armature in the meter is locked up.It doesn't move with the lights on or when running the radio gear.


What makes you guess the meter armature is "locked up"?
Because the needle doesn't move under any condition?

Did the needle ever move in the past and just recently quit?
Or --- it never worked?

You have to answer all the questions asked if you want constructive troubleshooting help.
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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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radtech
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PostPosted: Wed Apr 24, 2024 10:49 am    Post subject: Reply with quote

The needle has never moved and the resistance through the meter shows a complete circut.I put a battery to the meter and the needle still doesn't move.
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wesk
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PostPosted: Wed Apr 24, 2024 11:46 am    Post subject: Reply with quote

Radtech, could you answer this question I asked above earlier?

Quote:
PostPosted: Mon Apr 22, 2024 12:36 pm Post subject: Reply with quote Edit/Delete this post Delete this post View IP address of poster
So, is your electrical system completely stock and original? Including the voltage regulator? The Army introduced a transistorize voltage regulator around 1959. Also a Delco generator and regulatyor were optional. When you first start the jeep does the amp meter show a positive charge then taper off to the middle neutral position?

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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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radtech
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PostPosted: Wed Apr 24, 2024 12:35 pm    Post subject: Reply with quote

Wiring from regulator to amp meter read good.Regulator is Autolite VBC 4002UT.I also checked the meter shunt resistor in the regulator which I thought might be the problem it is good.
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wesk
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PostPosted: Wed Apr 24, 2024 8:41 pm    Post subject: Reply with quote

And an answer to this questions as well:

Quote:
When you first start the jeep does the amp meter show a positive charge then taper off to the middle neutral position?


Also is the generator Auto-Lite as well????

Also have you had the regulator and generator bench checked by an automotive electrical shop?
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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radtech
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PostPosted: Fri Apr 26, 2024 7:58 pm    Post subject: Reply with quote

New amp gauge solved the problem
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