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radtech Member
Joined: Aug 09, 2010 Posts: 203
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Posted: Sun Apr 21, 2024 4:49 pm Post subject: 1950 M38 no reading on the dash amp meter |
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The generator is charging 30 volts but no reading on the amp meter |
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4x4M38 Member
Joined: May 30, 2014 Posts: 3460 Location: Texas Hill Country
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RonD2 Member
Joined: Oct 02, 2014 Posts: 2004 Location: South Carolina, Dorchester County
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Posted: Sun Apr 21, 2024 6:47 pm Post subject: |
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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? _________________ 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 Member
Joined: Aug 09, 2010 Posts: 203
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Posted: Sun Apr 21, 2024 7:50 pm Post subject: |
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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 Member
Joined: Aug 09, 2010 Posts: 203
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Posted: Sun Apr 21, 2024 8:22 pm Post subject: |
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Found one on ebay NOS. |
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G740 Member
Joined: Jan 27, 2006 Posts: 500
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Posted: Mon Apr 22, 2024 5:50 am Post subject: |
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What voltage regulator are you running? Solid state or mechanical?
John |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16365 Location: Wisconsin
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Posted: Mon Apr 22, 2024 9:33 am Post subject: |
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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. _________________ 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 Member
Joined: Aug 09, 2010 Posts: 203
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Posted: Mon Apr 22, 2024 12:20 pm Post subject: |
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Current draw is only around 8 amps in receive and 12 in transmitt.It has never affected the batteries. |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16365 Location: Wisconsin
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RonD2 Member
Joined: Oct 02, 2014 Posts: 2004 Location: South Carolina, Dorchester County
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Posted: Mon Apr 22, 2024 4:31 pm Post subject: |
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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. _________________ 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 Member
Joined: Aug 09, 2010 Posts: 203
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Posted: Wed Apr 24, 2024 10:49 am Post subject: |
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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 Site Administrator
Joined: Apr 04, 2005 Posts: 16365 Location: Wisconsin
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Posted: Wed Apr 24, 2024 11:46 am Post subject: |
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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? |
_________________ 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 Member
Joined: Aug 09, 2010 Posts: 203
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Posted: Wed Apr 24, 2024 12:35 pm Post subject: |
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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 Site Administrator
Joined: Apr 04, 2005 Posts: 16365 Location: Wisconsin
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radtech Member
Joined: Aug 09, 2010 Posts: 203
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Posted: Fri Apr 26, 2024 7:58 pm Post subject: |
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New amp gauge solved the problem.A couple taps with a plastic mallet and the old one now works. |
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