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mf 35 postive grounded gas gauge


 
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john in the highlands
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Location: The Highlands of Ontario, Canada

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PostPosted: Sun Oct 21, 2012 8:35 am    Post subject: mf 35 postive grounded gas gauge Reply to specific post Reply with quote

I'm getting around to fixing up the old gal. I've got a new postive grounded gas gauge, seems only to take 3 volts to make it read full (using 2 AA batteries. However the new sending unit and my old one, no matter what the gas level, in my 12 volt system sends way to much voltage. Since the TSC catelogue only offers only one postive grounded gauge, do I have the wrong mf 35 sending unit? Am I missing some voltage reducer? I've been playing with the sending unit, There's more voltage resistance the lower the gas level, so that part's working to indicate the gas level change.
 
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Tony in Mass.
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PostPosted: Sun Oct 21, 2012 9:30 am    Post subject: Re: mf 35 postive grounded gas gauge Reply to specific post Reply with quote

Look for the wiring diagrams in the FENA website, sounds like it needs a reduce don't it?
 
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35 MF
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PostPosted: Sun Oct 21, 2012 11:20 am    Post subject: Re: mf 35 postive grounded gas gauge Reply to specific post Reply with quote

Why did you get a positive ground gauge? I believe all the 35's were negative ground.
 
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john in the highlands
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PostPosted: Mon Oct 22, 2012 10:11 am    Post subject: Re: mf 35 postive grounded gas gauge Reply to specific post Reply with quote

mine's a positive ground. Apparently tractors and trucks earlier on were positive grounded to reduce the chance of shorting out causing an explosion. Also, copper wires originally weren't coated so they corroded quicker if the ground was negative.
 
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john in the highlands
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PostPosted: Mon Oct 22, 2012 10:14 am    Post subject: Re: mf 35 postive grounded gas gauge Reply to specific post Reply with quote

Thanks, Ill try that
 
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35 MF
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PostPosted: Mon Oct 22, 2012 7:00 pm    Post subject: Re: mf 35 postive grounded gas gauge Reply to specific post Reply with quote

Some tractors that were 6 volt were positive ground like an 8N but I'm pretty sure a 12 volt MF 35 is negative ground. I know there are people on this forum that would know for sure.
 
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Chip812
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PostPosted: Tue Oct 23, 2012 6:32 am    Post subject: Re: mf 35 postive grounded gas gauge Reply to specific post Reply with quote

Mine is negative ground. 1961 MF35 Deluxe
 
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john in the highlands
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PostPosted: Sun Nov 04, 2012 8:03 am    Post subject: Re: mf 35 postive grounded gas gauge Reply to specific post Reply with quote

I finally found a postive grounded gas gauge from a&i, It says 12v on it. I used a circuit tester on it (2-AA batteries, 3 volts), my fuel sender is 30-250ohms, when the sender is at it's highest resistance using the 3 volts, the gauge reads empty and then reads full with 30ohms resistance. it reads full all the time in both with the 12 volt tractor battery. But, the gauge only works in both cases , when the ground is negative.
U.K.mf 35 tractors were 12 postive grounded, why is my U.S. tractor postive grounded when the rest are negative? It's a pain in the butt! I'm trying to get my supplier to replace the gauge, it's got to be deffective!
 
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