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7080 fuel gauge

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DCAC View Drop Down
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Joined: 20 Oct 2018
Location: east central SD
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DCAC Quote  Post ReplyReply Direct Link To This Post Topic: 7080 fuel gauge
    Posted: 16 Jan 2022 at 8:56pm
Looking for a working OEM fuel gauge for an "81 7080, NOS or good used, Thanks gentlemen!
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Codger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2022 at 8:59pm
Have you verified the gauge is bad and not wiring or the transmitter in the fuel tank, (sender/float)?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DCAC Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2022 at 9:07pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2022 at 9:26pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote DCAC Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2022 at 9:43pm
Thanks Codger, I'll pass that along!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 2022 at 10:13pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote DCAC Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2022 at 12:08pm
Thanks again, Codger, I passed this along to the owner as well!
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CrestonM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CrestonM Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 2022 at 1:20pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote DCAC Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2022 at 4:44am
Thanks Creston!  I'll let the owner know that too!
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Gary(WI) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary(WI) Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2022 at 6:42am
Djs tractor has that gauge

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Post Options Post Options   Thanks (0) Thanks(0)   Quote DCAC Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2022 at 6:38pm
I think that's where this gauge came from
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