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willysmjeeps.com :: View topic - M38 Oil pressure gauge line AND Engine Temp Connection
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M38 Oil pressure gauge line AND Engine Temp Connection

 
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ColKilgore2860
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Joined: Nov 01, 2019
Posts: 12
Location: Story, Wyoming

PostPosted: Tue Apr 07, 2020 9:47 pm    Post subject: M38 Oil pressure gauge line AND Engine Temp Connection Reply with quote

I tossed the Oil gauge and the Temp gauge when I got this jeep, because they were not original. I bought the reproduction gauge that had the Douglas connectors, along with a oil p. sending unit. I'm not sure how these are connected now. I'm assuming I need to buy some wiring loom? and some male electrical ends? Is there an actual wiring cable for these two guages and corresponding sending units?
I'm sure the answer is right in front of my nose.....
Thanks!

A
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Adam Jahiel
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Story, Wyoming
M38A1 & M38
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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 14836
Location: Wisconsin

PostPosted: Tue Apr 07, 2020 10:52 pm    Post subject: Reply with quote

If your Jeep is stock military 24V electrical & 24 V waterproof harness then you need do nothing and just connect the correct #33 (water temp) & #36 (Oil Press) wires to them.

If your M38 is not stock and/or has a butchered harness then we can offer little help without you first posting photos of both sides of your engine, firewall harness, harness between firewall & dash and a closeup of the back side of your instrument cluster.

The manuals that should be on your work bench right now are the M38 parts manual ORD 9 SNL G-740 (you need to review the engine illustrations, the harness illustrations and the instrument cluster illustrations). and TM 9-8012 your primary M38 service & operations manual for the same illustrations and the detailed wiring diagrams.


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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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ColKilgore2860
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Joined: Nov 01, 2019
Posts: 12
Location: Story, Wyoming

PostPosted: Thu Apr 09, 2020 6:37 pm    Post subject: OIL/WATER SENSORS Reply with quote

I replaced the oil sensor with one I got from DeBella. I'm not sure how it is humanly possible to get a wrench on those things, but I managed with only a slight amount of skinned hands and arms. I may have to remove it again after I order the proper holding bracket that bolts onto the bell housing area.

The temp sensor is definitely not original. Can I use the existing setup, or might it read incorrectly? No idea if there is a difference or if, like the oil, it needs to be a matched set.

I want to say thank you to Wes and everybody for this incredible site. I can't say how helpful, interesting, motivating, and fun it is.
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Adam Jahiel
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Story, Wyoming
M38A1 & M38
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4x4M38
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Joined: May 30, 2014
Posts: 2981
Location: Texas Hill Country

PostPosted: Thu Apr 09, 2020 7:12 pm    Post subject: Reply with quote

There were two M38 temp gauges and senders. If you have the early M38 temp gauge with resistor on the back it takes a different sender than the later unit. Brent Mullins in College Station has them NOS in the package.

So yes they must be matched.
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Brian
1950 M38
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wesk
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Location: Wisconsin

PostPosted: Thu Apr 09, 2020 8:24 pm    Post subject: Reply with quote

Adam, You really need to better inform us what you have on your M38 before we can intelligently offer you advice. What Oil Temp Sender do you have? Is your m38 stock 24V or modified to 12V? The aftermarket gauges you removed were what brand & model?
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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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