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Tractor Talk Discussion Forum

1952 8N (12 Volt conversion) electrical problem

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Greg Heath

09-18-2006 04:09:14




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I accidently connected jumper cables backwards to my 8n - it fried something! My ammeter now is all the way to the right and no lights nor any sign of life. Something was smoking under the hood, but I didn't get a chance to see what it was before it stopped smoking. Does anyone know where I should start to figure out and replace parts? I'm not that great with electrical diagnostics, but I'm willing to learn. Looking at the entire 12 volt conversion electronic ignition that this tractor has had, it doesn't look that complicated. Any help would be greatly appreciated, thanks

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Jon Hagen

09-19-2006 18:26:05




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 Re: 1952 8N (12 Volt conversion) electrical proble in reply to Greg Heath, 09-18-2006 04:09:14  
If you were very lucky,and had the ignition switch off when you reverse connected the booster cables,then the ignition system may be OK. The pegged amp guage and the smoke under the hood may be a burned up amp guage. If the guage burned off the internal shunt quickly,it may not have damaged the rectifier unit in the alternator. You also need to carefully inspect the heavy wire from the alternators BAT terminal to the amp guage for melted/burned insulation. There should be another heavy wire from the other amp guage terminal connected to the battery,usually connected where the battery cable connects to the starter switch. That 8N amp guage is not designed to flow many amps,and hopefully was the weak link in the system,hope it burned out before doing major damage to the wiring harness and alternator.

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Greg Heath

09-20-2006 03:46:29




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 Re: 1952 8N (12 Volt conversion) electrical proble in reply to Jon Hagen, 09-19-2006 18:26:05  
Jon, how right you are so far. I took my alternator in last night - checked out ok, however; my battery and ammeter are fried. I will replace both of these this weekend. I will check all the wiring very carefully to make sure there isn't any burns. When I connect everything back are there some precautions that I need to take to make sure there isn't any additional shorts that could fry any other parts or do you think It would be ok to reconnect and go from there to test the rest of the system? Hopefully, when I inspect/repair the wiring and connect the ammeter and battery back up, all will be fine - including the electronic ignition. Thanks for you help.

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old

09-18-2006 07:25:50




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 Re: 1952 8N (12 Volt conversion) electrical proble in reply to Greg Heath, 09-18-2006 04:09:14  
I'll bet you fried the alternator, they don't like to be hooked up back wards BTDT and fried the alternator before I could even think about unhooking the battery.



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Greg Heath

09-18-2006 10:40:10




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 Re: 1952 8N (12 Volt conversion) electrical proble in reply to old, 09-18-2006 07:25:50  
Thanks for your reply. When you did it, did your ammeter peg the right side and stay there? Was your alternator all that you fried? I will have the alt. tested and if defective, I will replace. I just didn't want to reconnect a new alternator and have it fried again because I missed something else that was fried and didn't have enough sense (knowledge) to replace it in along with the alt.



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old

09-18-2006 11:32:11




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 Re: 1952 8N (12 Volt conversion) electrical proble in reply to Greg Heath, 09-18-2006 10:40:10  
When I did that it was on another machine and it used a ford alternator so I can't help as far as what your asking. I just know it fried the alternator and it did it fast. I did notice that some one else also said you probably fried your Eletronic ignition and I would say thats true also. Any of the electronic is very touchy about haveing the battery hook up with the correct ground or it fries thing

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Bus Driver

09-18-2006 04:28:40




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 Re: 1952 8N (12 Volt conversion) electrical proble in reply to Greg Heath, 09-18-2006 04:09:14  
Have the alternator tested. It may be "fried". The electronic ignition may be "toast". Is it time to eat?



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