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DCAC 
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Joined: 20 Oct 2018
Location: east central SD
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 Topic: 7080 fuel gauge
Posted: 16 Jan 2022 at 8:56pm |
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Looking for a working OEM fuel gauge for an "81 7080, NOS or good used, Thanks gentlemen!
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Codger
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Joined: 23 Dec 2020
Location: Utopia
Points: 2213
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Posted: 16 Jan 2022 at 8:59pm |
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Have you verified the gauge is bad and not wiring or the transmitter in the fuel tank, (sender/float)?
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DCAC
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Location: east central SD
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Posted: 16 Jan 2022 at 9:07pm |
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It's not my tractor, but supposedly it works, just not when the lights are turned on. A new reproduction gauge has been installed.
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Codger
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Posted: 16 Jan 2022 at 9:26pm |
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that sounds like a wiring issue rather than a bad part. I'd check the 12VDC feeding the gauge to ensure it is not dropping off when the lights are switched on. If it works without the lights it seems the variable resistor, (sending unit) is working correctly.
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DCAC
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Posted: 16 Jan 2022 at 9:43pm |
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Thanks Codger, I'll pass that along!
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Codger
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Posted: 16 Jan 2022 at 10:13pm |
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This interprets as a corroded, or compromised electrical connection feeding the gauge. The variable resistor is usually connected to the negative side of the gauge and a switched voltage applied to the other positive side.
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DCAC
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Joined: 20 Oct 2018
Location: east central SD
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Posted: 17 Jan 2022 at 12:08pm |
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Thanks again, Codger, I passed this along to the owner as well!
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CrestonM
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Joined: 08 Sep 2014
Location: Oklahoma
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Posted: 17 Jan 2022 at 1:20pm |
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I drove a Steiger that had the gauges quit working when the lights were on. Turned out, grounding issues were at fault. Apparently it can ground through the filaments in the bulbs and that causes issues.
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DCAC
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Joined: 20 Oct 2018
Location: east central SD
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Posted: 18 Jan 2022 at 4:44am |
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Thanks Creston! I'll let the owner know that too!
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Gary(WI)
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Location: WI
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Posted: 18 Jan 2022 at 6:42am |
Djs tractor has that gauge
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DCAC
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Posted: 18 Jan 2022 at 6:38pm |
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I think that's where this gauge came from
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