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Ford 9N, 2N & 8N Discussion Forum
Order Ford 8N Parts Online

Ammeter/wiring problem on my 8n

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Biffer5

08-11-2020 14:05:15




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I always feel like a real dufus presenting my latest problem as I always seem to first struggle with even the simplist problems.....

The wiring on my resister block has been coming loose. Specifically the three wires on the bottom. So I thought I would take off the nut, replace the screw and nut and make it better. Well I did that and the damn thing started smoking. Specifically, the yellow wire going to the ammeter. I have no idea what shorted as I didn't think I did anything differently from what was there. I did take the block off and (but not the other wires) and screwed it back on after attaching the three wires back. So now I have a melted yellow wire and, what's worse, an ammeter that is now showing zero, I mean the guage is all the way to the left as far as it will go. I'm assuming it is burned out?
Here is a picture I took before "fixing" it. If anyone can give me some help here I would appreciate it.


Here is the link if that does not work:

http://peytonart.com/images2/ammeter.jpg

Thanks!!

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Tim PloughNman Daley

08-13-2020 06:34:25




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Did you have power ON when you switched around wires? Have your ESSENTIAL MANUALS handy? Wiring diagrams shown in all of them. FORD 8N TRACTOR WIRING DIAGRAMS:




*PICTOGRAM courtesy of JMOR

FORD OEM BALLAST RESISTOR -USED ONLY WITH FRONT MOUNT DISTRIBUTOR:

FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:

Tim Daley(MI)

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JMOR

08-12-2020 20:45:17




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Quoting Removed, click Modern View to seeSorry, but you only have a 'simple' understanding. As the coil heats, current would decrease so much as to reduce spark energy to only about 60%, but withthe temperature sensitive ballast, it also functions to prevent such a reduction.



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Left Coast Geek

08-12-2020 17:42:05




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Quoting Removed, click Modern View to see

more specifically, it LIMITS coil current.
the resistor is designed so it heats up, initially its lower resistance so you get more/hotter spark when you start the engine, then as current flows, it heats up and raises the resistance to reduce the current so you don't end up burning out the coil.



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JMOR

08-12-2020 09:24:20




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Quoting Removed, click Modern View to seehelps stabilize coil current.



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Biffer5

08-12-2020 09:01:31




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
I will.

What does the resister block do?



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Jim L WA

08-12-2020 08:20:13




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Sorry that happened to you. You might consider ordering a new resistor block along with an ammeter. Then everything should stay tight.



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TheOldHokie

08-12-2020 06:44:27




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Quoting Removed, click Modern View to see

YT has it for a whopping $6.50:

N-series Ammeter

TOH



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Biffer5

08-12-2020 06:33:11




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
great, thanks



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Left Coast Geek

08-12-2020 06:31:57




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
I don't know if anyone makes reproductions of the original meter, but there's a wide range of similar sized meters available in the marine market.

For instance...
https://www.defender.com/product.jsp?name=vdo-marine-vision-black-60-amp-ammeter&path=-1|311|2349076|2349077&id=1674468



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Biffer5

08-12-2020 06:25:11




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Thanks all.

One last question... could you steer me to where I can get a new ammeter? Don't see it on this site.



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Left Coast Geek

08-11-2020 17:49:26




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Quoting Removed, click Modern View to see

as long as the shunt is intact, yes. the shunt carries 99.9% of the current, only 0.1% goes through the ammeter itself, they are typically a 1mA mechanism



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Biffer5

08-11-2020 16:27:54




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
I'll buy a new one but just curious, will the tractor still start with that ammeter burned out?



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JMOR

08-11-2020 16:26:26




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Quoting Removed, click Modern View to seemost likely. Only wire limited the current



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Biffer5

08-11-2020 15:12:23




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
Quoting Removed, click Modern View to see

I bet that's it. . It's a round head and I thought it was sunk enough but I bet it isn't.

How about that ammeter? Burned out?



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JMOR

08-11-2020 14:56:34




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 Re: Ammeter/wiring problem on my 8n in reply to Biffer5, 08-11-2020 14:05:15  
The head of the screw that you replaced is very likely shorting to the metal part of tractor that block is attached to. Not properly countersunk.



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