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willysmjeeps.com :: View topic - Tachometer wiring
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Tachometer wiring

 
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horse
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Joined: Sep 08, 2019
Posts: 187
Location: Yorkshire U.K.

PostPosted: Sat Mar 25, 2023 10:38 am    Post subject: Tachometer wiring Reply with quote

How would you wire up a Tacometer to the M38?
I have the full waterproof 24v system.
I notice the Plug part number 73748888 on the Auto-Lite Distributor cover assembly could be removed and gives access to the coil I think?
I would like to set the tick over a bit more accuratly, I have been using a inexpensive Laser type gun on the Crankshaft nut which works okay but fluctuates a lot.
It will not be a permanent fixture just used for tuning up.
Any ideas would be appreciated.
Horse.
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RonD2
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Location: South Carolina, Dorchester County

PostPosted: Sat Mar 25, 2023 10:54 am    Post subject: Reply with quote

Hi Horse,
I think having one of these 24V military adapter kits would solve your question.

http://willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=8710&highlight=adapter+kit

http://willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=12242&highlight=adapter

Good luck!
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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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horse
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Location: Yorkshire U.K.

PostPosted: Sat Mar 25, 2023 11:06 am    Post subject: Reply with quote

Thanks Ron, that would be a nice kit to have.
Any other way around the problem until one pops up at a reasonable price?
Horse.
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wesk
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PostPosted: Sat Mar 25, 2023 11:06 am    Post subject: Reply with quote

Same way the Army did.













These adapters can be used easily with both military test sets and civvy test sets. Just follow the directions for test connections of the Dwell/Tach you are using and employ the appropriate military harness adapter. Same with timing lights and coil test sets.
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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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wesk
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PostPosted: Sat Mar 25, 2023 11:11 am    Post subject: Reply with quote

Horse said:
Quote:
Any other way around the problem until one pops up at a reasonable price?
Horse.


Just use old harness parts and plugs and build your own adapters.
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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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horse
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PostPosted: Sat Mar 25, 2023 11:13 am    Post subject: Reply with quote

Thanks Wes, will keep an eye out a good bit of kit to have.
Horse
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wesk
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PostPosted: Sat Mar 25, 2023 4:06 pm    Post subject: Reply with quote

What brand model dwell tach are you using?

Here's another helpful Publication from PS magazine: chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/http://willysmjeeps.com/downloads/24%20Volt%20Electrical%20Equipment%20Testing.pdf
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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


Last edited by wesk on Sat Mar 25, 2023 4:17 pm; edited 1 time in total
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horse
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PostPosted: Sat Mar 25, 2023 4:13 pm    Post subject: Reply with quote

I have not bought one yet as I did not know how to wire it.
Open to advice on that as well.
Horse
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wesk
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PostPosted: Sun Mar 26, 2023 12:35 am    Post subject: Reply with quote

I have used a Military Simpson for many years and got used to it. I also have civvy Dwell/Tachs from Craftsman and Sun.

You can download and review test set handbooks here:
http://www.willysmjeeps.com/v2/modules.php?name=Downloads&d_op=viewdownload&cid=57
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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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horse
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PostPosted: Sun Mar 26, 2023 1:15 am    Post subject: Reply with quote

Thanks for the information.
I will check out the suggested units and see what is available over this side.
Horse.
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horse
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PostPosted: Sun Mar 26, 2023 5:30 am    Post subject: Reply with quote

Bit of a result.
One of my old timing lights has a switch to show RPM which I had forgotten about, so all is well again.
I will still look out for the military kit.
Horse.
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