175 & 6080 electrical issues
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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=140482
Printed Date: 21 May 2025 at 6:54am
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Topic: 175 & 6080 electrical issues
Posted By: wekracer
Subject: 175 & 6080 electrical issues
Date Posted: 16 Jul 2017 at 7:53pm
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I'm having a problem with both tractors. In both cases the fuel and temp gauges read wrong. The 175 temp gauge reads low and fuel gauge reads high. 6080 is the opposite. I've been told to check for good ground. Does anyone have any good suggestions on how to trouble shoot this. Thanks
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Replies:
Posted By: AC720Man
Date Posted: 17 Jul 2017 at 6:46am
Had similar issue with my 190xt after i painted it. I disassembled most of the tractor and had to remove paint to get to bare metal where the lights attach to the fenders. Also where the fuel tank and fender bolt together in order for the fuel gauge to work., And for the temp gauge to work, I had to remove paint in the instrument panel hole and clean up the outer gauge itself in order to get a good ground. Both gauges work great now.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: wekracer
Date Posted: 23 Jul 2017 at 8:18pm
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Today I was planning on clipping pastures with the 6089 so I ran a jumper wire from the ground post on the temp fuel gauge to the negative post on the starter. No noticeable change. It does seem like both work fine until it gets warmed up. Them temp gauge goes up and fuel gauge drops. Anyone have any ideas. My next guess is sending units. Thanks
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Posted By: ctbowles58
Date Posted: 23 Jul 2017 at 8:35pm
I had the same trouble with my 6080, and a new gauge fixed it.
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190XT 2WD45 WF D15 D14 CA BIG10 302 & 303 bailers 77G rake 80R mower 6 plows and alot more
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Posted By: AC720Man
Date Posted: 23 Jul 2017 at 8:48pm
If i remember correctly, disconnect the sending wire to the fuel tank. Ground that post at the gauge with a temporary jumper and the gauge should go to full if the gauge is good. If not replace the gauge. Mine went to full so I replaced the defective sending unit. This was before I painted the tractor. Both of my gauge problems were due to poor ground after the paint job. If you have verified a good ground with a volt ohm meter, check your wiring and make sure you do not have a wire rubbing against metal some where. Test end to end with a volt ohm meter to verify continuity and that a ground doesn't exist. The gauge and sending unit wiring have to be disconnected at each end to perform these tests. Test one wire at a time with one test lead to the wire and the other to ground to check for a ground. If all checks out good, then I would replace the least expensive part first, most likely the sending unit as far as the temp gauge. Bill at Sandy Lake is very helpful when it comes to trouble shooting gauges. If he has time he will walk you thru your questions over the phone. Super nice man and very knowledgeable.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: wekracer
Date Posted: 24 Jul 2017 at 4:37am
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Thanks for the input. The neighbor up the road has a service manual. I may see if it has any more test info. My operators manual doesn't. Just a wiring diagram.
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Posted By: DougG
Date Posted: 24 Jul 2017 at 1:16pm
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6080 temp/fuel gauge isn't bad last year they were 99 bucks thru Lauf if you need that
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Posted By: wekracer
Date Posted: 29 Jul 2017 at 12:27pm
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Update. I disconnected the sensing wires from the gauges and grounded them. The gauges seem to work fine so I ordered two new sending units. Hopefully that's the fix. Thanks
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Posted By: AC720Man
Date Posted: 30 Jul 2017 at 6:15pm
Great, let us know the results.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: wekracer
Date Posted: 16 Aug 2017 at 9:12am
Well I finally got the 6080 fixed. I changed bothe the fuel and temp sending units and it actually made things worse. I checked the wiring and determined it was good so I ordered a new gauge. Now everything seems to work as it should. Thanks for the help.
Now I need to tackle the 175 but it doesn't get used as much as the 6080.
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