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861 Fuel Gauge Help


 
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Tom Bond
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Joined: 02 Sep 2009
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Location: Illinois

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PostPosted: Wed Apr 18, 2012 6:18 pm    Post subject: 861 Fuel Gauge Help Reply to specific post Reply with quote

When I got my 861, the fuel gauge was not working. Bought all the manuals and according to the shop manual, the 6 volt has an ammeter and the 12 volt has the fuel gauge. My tractor is 6 volt. The owners manual shows a fuel gauge on the 6 volt console. Ok, the setup on my gauge is identical to the 12 volt wiring in the manual except my white wire with the fuseholder isn't hooked to anything. Well, I figured I give it a shot and use a light gauge jumper to the terminal block just to see if the fuel gauge actually works. As soon as the key was turned on, the jumper heated up and smoked the insulation. I took it off and no damage to anything else. Tractor still starts and lights work. Any idea what could cause this? Could be why it wasn't hooked up when I got it. Could a bad sending unit do this? I've included a few pics to show you my setup and the wiring diagrams from the manual. I'm pretty sure it's wired correctly. Thanks AGAIN! Tom
 
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awhtx
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Joined: 16 Jan 2002
Posts: 5051
Location: Lampasas, TX

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PostPosted: Fri Apr 20, 2012 6:10 am    Post subject: Re: 861 Fuel Gauge Help Reply to specific post Reply with quote

All 801 series tractors had a fuel gauge. The Gas tractors were 6V and Diesels were 12V. The gauges and sending units have different part numbers for 6V or 12V. I have never seen an original working fuel gauge on a 801.
 
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Larry NCKS
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Joined: 23 Dec 2001
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PostPosted: Fri Apr 20, 2012 6:21 am    Post subject: Re: 861 Fuel Gauge Help Reply to specific post Reply with quote

ditto on all *01 series having fuel gauges. *00 series had ammeters.

You must have a direct short to ground somewhere. I would think it would more likely be in the gauge itself, but it could be anywhere in that circuit, I guess.
 


Last edited by Larry NCKS on Fri Apr 20, 2012 6:22 am; edited 1 time in total
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Tom Bond
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Location: Illinois

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PostPosted: Fri Apr 20, 2012 7:54 am    Post subject: Re: 861 Fuel Gauge Help Reply to specific post Reply with quote

What you guy's say makes sense. Looking at the 1st. picture again, the wires are connected right on the stud to the mounting bracket. I ll pull it apart when I get home to make sure that in itself isn't grounding the whole thing. I'll start by disconnecting the leads and checking to ground, component by component, wire to wire. Is there supposed to be some sort of isolation washer behing the back of the mounting bracket and the gauge itself? Thank You.
 
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Jimmyjack
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PostPosted: Fri Apr 20, 2012 8:53 am    Post subject: Re: 861 Fuel Gauge Help Reply to specific post Reply with quote

I never thought about it before, but I have a 1955 861 that does not have a fuel guage? No signs that it ever did either.
 
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awhtx
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PostPosted: Fri Apr 20, 2012 9:03 am    Post subject: Re: 861 Fuel Gauge Help Reply to specific post Reply with quote

If it"s a 1955 model it"s an 860 and it had an ammeter and no fuel gauge. If it"s an 861 it"s a 1958-1962 model and it had a fuel gauge and a charge indicator light.
 
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awhtx
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Location: Lampasas, TX

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PostPosted: Fri Apr 20, 2012 9:06 am    Post subject: Re: 861 Fuel Gauge Help Reply to specific post Reply with quote

I just looked at your photo and you are correct- the wire is connected to the fuel gauge mounting stud which is definitely a direct short to ground and will melt any wire!
 
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