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Ford 9N, 2N & 8N Discussion Forum
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For soundguy, others: What! No fuse?

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A. Bohemian

03-27-2007 12:08:16




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Well, I am still learning about these tractors.

I was following up on an earlier post about a starter that was smoking. I though that a direct short should cause the fuse to blow, blah, blah, blah...

In any event, soundguy corrected me. Apparently there is NO FUSE in the starter circuit of the Ford 8N!

And (this is REALLY embarrasing, but I want to be honest here) careful examination shows the fuse that I thought was protecting the whole electrical system on my Super C all these years is really only protecting the lights!

I do apologize. And, if I ever have to mess with the wiring compartment, I'm going to put a fuse inline that will protect the whole system, someplace where it won't show.

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Dunk

03-27-2007 17:40:03




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 Re: For soundguy, others: What! No fuse? in reply to A. Bohemian, 03-27-2007 12:08:16  
Exactly as the other guys have said.

You won't find the primary starter circuit fused in anything.

My battery in my Blazer is good fer 900 starting amps, have you ever seen a 900 amp fuse? It is huge!!

And no they are NEVER used in vehicles.



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dave guest

03-27-2007 17:35:48




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 Re: For soundguy, others: What! No fuse? in reply to A. Bohemian, 03-27-2007 12:08:16  
Now you need a fuseblock and a bunch of fuses. How about fusible links, too. How did the old timers ever feel safe? Old cars same way.



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dan hill

03-27-2007 13:24:45




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 Re: For soundguy, others: What! No fuse? in reply to A. Bohemian, 03-27-2007 12:08:16  
You have to study basic electricity.200 amp fuses are costly..



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roger '40 9n

03-27-2007 12:25:15




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 Re: For soundguy, others: What! No fuse? in reply to A. Bohemian, 03-27-2007 12:08:16  
That is going to be one BIG fuse.
Your starter draws more than 200 amps.
A 200 amp fuse will not protect the rest of the wiring on your tractor. You should match the size your fuses to the size of the wires. If your alternator wires are rated for 30 amps (# 10 wire) then you should use a 30 amp fuse for them.

You want the fuse to blow before your wire melts. :^)

Roger in Michigan



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A. Bohemian

03-28-2007 07:09:46




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 Re: For soundguy, others: What! No fuse? in reply to roger '40 9n, 03-27-2007 12:25:15  
Yeah, after I posted this I got to wondering if I had ever seen a fuse inline with a starter and decided I never had.

I knew a starter drew a LOT of current, but had no idea how much. I had always had the (apparently mistaken) idea that cranking amp ratings on batteries were wildly exaggerated for marketing purposes, kind of like the gain ratings commercial antenna manufacturers use.

So, if the Blazer is rated at 900 amps, I'll bet it could pull a kilo-amp under the right circumstances.

And, I'm going to take that advice about the 30 amp fuse for the generator.

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