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Beacher425 Member
Joined: May 16, 2010 Posts: 59
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Posted: Fri May 28, 2010 9:33 am Post subject: Genorator vs Alternator |
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I just bought a 1955 M38a1 that has the generator and regulator removed and an altermator installed. It reads on the unit as a 12v alternator. The starter is original 24v and it still has the 2 batteries in series installed. Looks like lights are 24v. Would it be easier to just complete the 12v changeover, or to return to 24v. If I return to 24v, does a 24v alternator exist? At the sale the jeep started and ran ok.
Thanks
Jeff
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MODIFIED Member
Joined: Mar 28, 2008 Posts: 353 Location: BrOoKlYn
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Posted: Fri May 28, 2010 11:44 am Post subject: |
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what is you intended use with the vehicle, i.e; sunday drives, restoration, trails, primary driver, shows ?
I think if your jeep possess most of the 24 volt components keep it 24v..
check the following :
STARTER
GENERATOR
gen cable
VOLTAGE REG
DISTRIBUTOR
igniton cables
LAMP BULB
GAUGES |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16267 Location: Wisconsin
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Beacher425 Member
Joined: May 16, 2010 Posts: 59
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Posted: Tue Jun 01, 2010 11:44 pm Post subject: |
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I delayed posting so i could reexamine the jeep and the alternator is a 12V Delco. I see only 1 wire extending from it to the starter.
I plan on getting it running and using it for occasional drives around town and light offroad on some land I own. Overtime I will have the subcomponants overhauled and eventually down to the frame. The jeep is in such good shape now, i don't feel it neccessary to take it all the way down to the frame now. I would like it to be a "rolling restoration" that my kids and I can do peicemeal.
Jeff |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16267 Location: Wisconsin
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Posted: Wed Jun 02, 2010 7:45 am Post subject: |
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If your batteries are in series (pos-neg-pos-neg) they will produce 24 volts which will work with your starter but will quickly burn up the internal regulator in a 12 volt alternator.
This means there are only the following possibilities:
1-The alternator's internal regulator is burned out and it is not producing voltage anymore.
2-The alternator has been converted to 24 volts.
3-There's a hidden dual voltage starting relay that starts on 24 volt and operates on 12 volt.
4-You batteries are not in series but are actually parallel (pos-pos) and (neg-neg) producing only 12 volts. (12 volts will turn a 24 volt starter slow).
5-Starter has been converted to 12 volt.
A few simple tests to determine what you really have:
1-Connect a voltmeter pos to the starter switch terminal with the battery pos cable on it. Connect the meter neg to the block or frame.
If it reads 12 volts you have batteries connected parallel. If it reads 24 volts you have batteries connected in series.
2-Start the engine and accelerate it to about 2,000 RPM.
If you had 24 volt on the batteries then it should now read 27.5 to 28.5 volts.
If you had 12 volts on the batteries then it should read 13.0 to 14.5 volts. _________________ 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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Beacher425 Member
Joined: May 16, 2010 Posts: 59
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Posted: Wed Jun 02, 2010 9:08 am Post subject: |
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Thanks! I will follow these and let you know what happens. |
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Beacher425 Member
Joined: May 16, 2010 Posts: 59
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Posted: Tue Jul 27, 2010 7:27 am Post subject: |
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Looks like the Alternator was a 24v after all. In disassebling the Jeep for a frame of restoration, on the under side of the alternator was "24v" painted on it. So I believe that it is a rebuilt alt ov 24v but in a shell of a 12v. We will see when it is all back together. Everything else coming off the jeep is 24v. |
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