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Old 11-04-2008, 12:09 PM   #1
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Default Ford 8N starting problems

I have a 8n tractor with the original 6V positive ground electrical system. The problem is it won't crank over unless it's jump started. The battery, acording to my tester shows it has 8V. If I Put the battery charger on it set at 6V it'll start but if I am in a hurry i put it at 12V.

This battery is only about a yr. old. Is there any way it could be anything but the battery? Solenoid maybe? Any help is appreciated.
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Old 11-04-2008, 01:19 PM   #2
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well, 12v into a 6v system (at least from what I've been told) is kinda bad for the electrical system, too much of a difference or something. It's the AMPs that are what you're after.

It does sound like a bad battery from the symptoms, there is likely a bad ground somewhere that is slowly draining the battery, or the Generator has stopped putting enough current out to charge the battery (but enough to run the engine, had a Cavalier alternator with that issue)

Most solenoids I've seen when they go bad have just stopped working all together.

I'd check to see how much current the generator is producing and examine all the wires for wear as a start for the diagnosis.
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Old 11-04-2008, 01:49 PM   #3
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sounds like a flat or bad battery. Stress test the battery.
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Old 11-04-2008, 02:36 PM   #4
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Thanks, i'll check it out tonight.
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Old 11-04-2008, 08:01 PM   #5
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The generator is putting out 7.4volts. I think i'll put a 8volt battery in it this weekend and see how that works for awhile. I have a friend who is a rep for interstate he can get me one cheap.
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Old 11-04-2008, 08:11 PM   #6
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Without lights it shouldn't require much juice at all to run it. You should get more than a couple starts before the battery is flat, if it goes down fast you have problems elsewhere.

I would look into a 12v conversion, 8v is a bandaid. 6v requires everything to be almost perfect to work right and is a pain for a working tractor.
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Old 11-04-2008, 08:28 PM   #7
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Go throught the system and clean all the connections.

Could the battery have frozen perhaps? It would take exposure to extremely cold tempuratures to kill it, not just below 32F or 0C.

Since you can still start it, its not the solenoid. I would lean towards a bad connection. I had a bad ground on my starter. It would start first time when cold but after that it would not start. I would have to wait a couple hours to try to start it again or I would have to smack the starter with a hammer to make it get a better connection again.
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Old 11-04-2008, 09:00 PM   #8
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There is nothing wrong with a good working 6v positive ground system. I have a 6v system working on an old standby generator... Still works just fine... You just have to do a little more maintenance from time to time (keep the connections clean)

Clean the crap out of all the connections... If it has an open mechanical start switch (I can't remember, it's been a long time since I worked on an 8n), clean it and hit the contacts with steel wool. Then test the battery, if that checks ok, check the starter.

Don't do the 8v system, You'll just kill everything else in the electrical system sooner.

Make certain that all of your cables and connections are good before anything else!!
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Old 11-04-2008, 09:06 PM   #9
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Default Don't burn up the rest of the stuff...

You said the battery is one year old.
Do you mean, you bought it one year ago?
If it sat on the shelf for four years because no one needed a 6 volt, then the battery is no good.
Get your interstate guy to get you a 6 volt battery and try it before you burn up the starter using an 8 volt, or burn up the 6 volt generator trying to recharge an 8 volt battery.
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Old 11-04-2008, 11:28 PM   #10
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Quote:
Originally Posted by v-8power View Post
The generator is putting out 7.4volts. I think i'll put a 8volt battery in it this weekend and see how that works for awhile. I have a friend who is a rep for interstate he can get me one cheap.
Yep, Generator is working fine, no issues there.

It's looking more towards a shady connection like the others mentioned.
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