M2 coolant temp gauge and Oil Press
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=112960
Printed Date: 14 Sep 2025 at 10:45am
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Topic: M2 coolant temp gauge and Oil Press
Posted By: dnel45
Subject: M2 coolant temp gauge and Oil Press
Date Posted: 06 Oct 2015 at 5:08pm
Have a Gleaner M2 that the coolant temperature gauge needle basically flatlined out of the temp range and doesn't move when turning the key on. Doesn't move at all when the combine is running either. Pulled the outside panel and all wires are connected as they should be. Any idea if this is the sensor or the gauge?
Also, same machine, oil pressure gauge moves very little, when running at full speed it will read up to less than 1/4 across the gauge. Motor is in good shape and has good oil pressure. Would this be a sensor? Thanks in advance
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Replies:
Posted By: MACK
Date Posted: 06 Oct 2015 at 10:23pm
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Ground temp. gauge wire at sender, gauge should go to hot. Check oil gauge the same way. MACK
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Posted By: Steve in NJ
Date Posted: 07 Oct 2015 at 7:12am
Sounds like you lost the ground at the dash. Put a jumper at the dash to a good chassis ground and see if everything works properly again. If so, that's the problem. Make a permanent ground off the dash...
Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Posted By: Lonn
Date Posted: 07 Oct 2015 at 8:56am
If what is said above all fails do like I did on my L2, had to pull the harness from out under the engine working through the grain tank to repair. I found that tiny critters used my harness for snacking.
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Wink
I am a Russian Bot
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Posted By: dnel45
Date Posted: 08 Oct 2015 at 6:37am
I tried what MACK said last night and had no movement from either gauge. I had the key on in the cab and put my test light on the coolant temp sender unit wire back on the motor and it lit up. I am assuming that means the wire back to the unit is okay? Does that mean my gauge is bad?
For the oil sensor, I tried grounding it back on the motor and the gauge didn't move, and I tried my test light and nothing lit up on either wire. Any idea what that indicates? Thanks.
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Posted By: Lonn
Date Posted: 08 Oct 2015 at 7:09am
Mice?
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Wink
I am a Russian Bot
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