Charging system troubleshooting

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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Kurt Lesser
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Charging system troubleshooting

Post by Kurt Lesser » Tue Feb 18, 2014 10:33 am

This is a link to a military pamphlet about troubleshooting military charging systems that I thought I'd post for the forum:

http://tinyurl.com/lv8mmoc
Kurt Lesser
US Navy, 1969-1975
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harry3rdID
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Re: Charging system troubleshooting

Post by harry3rdID » Tue Feb 18, 2014 5:08 pm

Thank you Kurt...
It is a great supplement to the manuals.

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Re: Charging system troubleshooting

Post by lten1063 » Tue May 20, 2014 4:01 pm

I know this DA PAM 750-33 way to well. It has sve me a lot of time and $'s to boot. I have the original of it. Not many survied and was going to the recycle bin when I rescued mine. I don't know if this is a PDF file of mine but will look at it at work and can tell with marks I put in mine.

Laer Joe
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"When something becomes FUBAR We Blame it on SNAFU Then Try to SWAG Our Way Out of it"
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Re: Charging system troubleshooting

Post by lten1063 » Wed May 21, 2014 4:57 pm

lten1063 wrote:I know this DA PAM 750-33 way to well. It has sve me a lot of time and $'s to boot. I have the original of it. Not many survied and was going to the recycle bin when I rescued mine. I don't know if this is a PDF file of mine but will look at it at work and can tell with marks I put in mine.

Laer Joe
A note! When I try to down load it has errors and won't fully down load.

Later Joe
"Apply The 5 "P" theory" (Previous Planning Prevents Poor Performance)"
"When something becomes FUBAR We Blame it on SNAFU Then Try to SWAG Our Way Out of it"
"My Wooden Nickels Worth"
"If ur Running Late, slo down & Walk Early next X"

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Re: Charging system troubleshooting

Post by Rickf » Wed May 21, 2014 5:36 pm

Downloaded and saved fine for me. I have a pretty fast connection though.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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lten1063
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Re: Charging system troubleshooting

Post by lten1063 » Thu May 22, 2014 5:17 pm

The error is a "ROOT DIRCTORY/FILE IS MISSING" or something like that.

Later joe
"Apply The 5 "P" theory" (Previous Planning Prevents Poor Performance)"
"When something becomes FUBAR We Blame it on SNAFU Then Try to SWAG Our Way Out of it"
"My Wooden Nickels Worth"
"If ur Running Late, slo down & Walk Early next X"

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Re: Charging system troubleshooting

Post by Bandit1 » Sat Sep 24, 2016 12:58 pm

Hello I put 2 new batteries in my 151a2 drove it alternator started whining then gauge pegged in the red volt meter showed 36 volts way to much. Tried to adjust did not work bought new regulator same result it is a 60 amp unit with regulator that attaches to back of alternator. Was working good till batteries went bad. Did notice when hooking up new batts got a arc when connecting ground like a draw on system everything was turned off. Wondering if the alternator has some internal short. Any feedback would be much appreciated thanks Doug

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Re: Charging system troubleshooting

Post by Rickf » Sat Sep 24, 2016 5:08 pm

Are you sure you hooked the batteries in series and not in parallel? And did you get the polarity correct? Always go back to the last thing you did and that was the batteries. You said it was fine before the batteries and then you had a spark hooking the batteries up. Makes me think something in the connection of the batteries is wrong.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: Charging system troubleshooting

Post by denubilo » Fri Apr 07, 2017 11:04 am

ARE 151 REGULATORS ADJUSTABLE?
My 151A1 quit charging. Generator tested ok. Got two "take-offs" from Red River that did not work.
Third one put out low current as measured at the dash gauge. Deflected about two needle widths into green.
My good regulator deflected about 3/4 up into the green.
Say hi to your Mrs. for me!
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Re: Charging system troubleshooting

Post by Rickf » Fri Apr 07, 2017 5:22 pm

They are only adjustable up or down a volt or two. It sounds like the DOA generator you got from Red River may have needed polarizing maybe? Other than brushes there is very little to go wrong in the 25 amp generator. You need to check the voltages at the batteries with it running at high idle with a real voltmeter, never believe the dash gauges until they are verified with real instruments. The dash gauges are notorious for being wrong. Also be sure the batteries are both in good condition and well charged.
And I would say hi to the missus for you but....................... I don't know who you are? :roll: :mrgreen:
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

denubilo
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Re: Charging system troubleshooting

Post by denubilo » Fri Apr 07, 2017 8:32 pm

I was sending that to Kurt Lesser. His wife was coordinating the camping spaces for the MVCC swap meet in Northern Cal. A great lady!
USMC 55-59
NRA Life Member
AMVETS Life Member
MVPA Member, MVCC Member
1943 IHC M-2-4 USMC, 1945 MB
Vickers MG (propane)
1839 Howitzer (repro),Civil War coehorn (repro)
And thanks to a whole lot of good people we made ALCAN12 !!!

denubilo
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Posts: 108
Joined: Sat Aug 22, 2009 1:03 am
Location: Kingman Arizona

Re: Charging system troubleshooting

Post by denubilo » Fri Apr 07, 2017 8:33 pm

Darn meant to ask how to make the adjustment. I saw a pot with a screwdriver slot on the circuit board.
USMC 55-59
NRA Life Member
AMVETS Life Member
MVPA Member, MVCC Member
1943 IHC M-2-4 USMC, 1945 MB
Vickers MG (propane)
1839 Howitzer (repro),Civil War coehorn (repro)
And thanks to a whole lot of good people we made ALCAN12 !!!

Rickf
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Posts: 5293
Joined: Sun Mar 19, 2006 12:04 pm
Location: Pemberton, New Jersey

Re: Charging system troubleshooting

Post by Rickf » Sat Apr 08, 2017 6:06 am

You must be working with the later electronic regulator. One of the guys on the g838 did some testing on those and found that one screw was the voltage adjustment and the other was the tip in adjustment. One thing he found was that different years and manufacturers out the screws in different spots so basically all he does is adjust one a half turn and see if it changes the voltage. If it does not he returns it to the original position and tries the other one. I have never done this myself since mine is working fine but if it ever craps out I have six spares to play with. :lol:
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

dcartledge
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Re: Charging system troubleshooting

Post by dcartledge » Thu Jun 10, 2021 9:57 am

How does one flash the generator (the type with the waterproof cannon plug)?
D
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