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PK Member
Joined: Jun 21, 2007 Posts: 6
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Posted: Tue Mar 25, 2008 6:31 am Post subject: Difficult Start |
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I have a difficult time starting my 1951 M38. When I press the starter foot switch, it seems as though the batteries are dead. If I hold the switch it turns very slowly and usually I can get it to start after several minutes and tries. When it starts it runs well.
I have charged the batteries.
I cleaned the terminals and where the ground attaches to the battery tray.
I get 24.5 volts with a digital meter with one lead on the starter terminal and the other lead to ground.
I had the starter checked at a local starter shop it checked out ok.
Any help is appreciated.
Thanks
PK |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16267 Location: Wisconsin
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Posted: Tue Mar 25, 2008 10:21 am Post subject: |
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If your ignition timing is advanced more than 5 Deg's BTDC then that will cause the slow starter rotation.
If the timing and point gap/condition is good then:
If the shop that checked the starter also opened and inspected the switch on top of the starter then you have a grounding issue. Is the ground strap between the right front engine mount plate and frame in place?
If the strap is clean and tight then it's time to do a voltage drop check of the entire circuit.
http://vernco.com/id606.htm
24.5 is not a fully charged dual 12 volt battery system. 25 to 26 would be more correct. With engine running at about 1200 RPM you should read 27.5 to 28.5 across the batteries. _________________ 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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PK Member
Joined: Jun 21, 2007 Posts: 6
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Posted: Tue Mar 25, 2008 3:54 pm Post subject: |
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Wes,
Thanks for the advice. I will check these things.
PK |
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bucky Member
Joined: May 10, 2007 Posts: 25
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Posted: Sun Mar 30, 2008 9:29 am Post subject: |
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Check battery voltage thru both batteries in series, compare to readings aquired off the starter post.......If there the same ,charge the batteries. If a drop is noted. use you meter to test at every connection bac toward the batterys. Watch for correct voltage to find your cruddy connection. Check you gruond strap for high resistance connections even if it looks clean. Looks can be decieveing. Also dont overlook terminals already cleaned check them all wirh your meter as well. Having learned the hard way.... bucky |
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DFoley Member
Joined: May 05, 2005 Posts: 105 Location: Del Rio, Texas
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Posted: Mon Mar 31, 2008 11:58 am Post subject: |
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wesk wrote: | If the strap is clean and tight then it's time to do a voltage drop check of the entire circuit.
http://vernco.com/id606.htm |
Wes I can not get this link to work...can you check it and see if it needs an update. _________________ Dan
1951 M38 |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16267 Location: Wisconsin
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ocwd Member
Joined: May 14, 2007 Posts: 721 Location: Placentia, CA
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Posted: Tue Apr 01, 2008 2:13 pm Post subject: Grounding/Bond Strap |
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Wes,
Is the metal grounding strap in your picture the only metal type on the M38? What is the correct length and thickness of that strap? I have a bunch of metal type bond straps in the garage and want to make sure that I keep a suitable strap for my Jeep. Is there a TM that has drawings of this strap?
Dave |
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16267 Location: Wisconsin
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ocwd Member
Joined: May 14, 2007 Posts: 721 Location: Placentia, CA
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Posted: Wed Apr 02, 2008 1:59 pm Post subject: Bond Strap |
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Thanks Wes. I'll just keep a couple of different sizes that are long enough to go from the engine mounting plate to the frame. In looking at your picture, I think I have one very similar. |
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