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No spark in the 8N

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Pawpaw

11-19-2005 20:11:52




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Now I'm not a mechanic and not quite even a gentleman farmer yet, but I need some help from y'all. I have a '49 8N that just flat won't start. Turns over good. A while back, it would die after about an hour and I had to wait a couple hours before I could start it. Other day, after I plowed some, I parked it and it won't start now. I replaced the coil and the fuel is good down to the carburator. Pulled a plug today and couldn't get a spark. What I read here, it might be a voltage regulator? I don't even know what that looks like. I do see a electric thing under the hood close to the seat that has 4 wires, 1 is a ground for sure. Below that is a little square deal with 6 dots on the bottom and it has 1 wire to it. There are 2 lugs on that thing, but only 1 wire goes to it. Now the switch and starter is good and generator. Battery is dead, but I been jumping to the starter to try and start. Anyone have an idea what might be wrong? Thanks a bunch.

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Pawpaw

11-20-2005 07:12:44




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 Re: No spark in the 8N in reply to Pawpaw, 11-19-2005 20:11:52  
Thanks for the help. The battery's been dead for a little while and I've jumped it to the starter a couple times to get it started. Seems like the battery won't get a charge and it's only about 4-5 months old. I'll charge it up, change the points, and try it again. It is a 6 volt, so I don't know what that little square deal with the one wire is. Don't find any second wire that could be attached, but maybe somebody started to convert it or something before I bought it. It was there like that when the tractor was running. Again, thanks.

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Dell (WA)

11-20-2005 08:52:00




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 Re: No spark in the 8N in reply to Pawpaw, 11-20-2005 07:12:44  
PawPaw..... ..you write "Below that is a little square deal with 6 dots on the bottom and it has 1 wire to it. There are 2 lugs on that thing, but only 1 wire goes to it"..... ..and..... ."I don't know what that little square deal with the one wire is. Don't find any second wire that could be attached".

I hope you are NOT DESCRIBING the "infamous ballast resistor" under yer ampmeter.

You write..... ."Seems like the battery won't get a charge and it's only about 4-5 months old"..... .I hope you remembered to re-polarize yer squarecan voltage regulator with an "arc-spark" between its BATT & ARM terminals. Remember, its supposed to be positive ground and you can re-polarize as many times as you want. (engine off)..... ...Dell

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Pawpaw

11-20-2005 12:07:39




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 Re: No spark in the 8N in reply to Dell (WA), 11-20-2005 08:52:00  
Dell - I guess I don't know what a ballist resistor is. This little square deal is 3/4" x 3/4" and a threaded end of it sticks through a hole in the bracket right below the voltage regulator. The single wire runs over to right below the ammeter and hooks to the same terminal as does a wire from the ignition switch. Is this bad? Should I just take it out? I don't see where there's been a second wire to it.

I haven't re-polorized and it is hooked up positive ground. At the voltage regulator there is a ground wire on the right (if you were sitting on the tractor), then 3 other wires in a row. I can't read anything there, so which one is the BAT and which one ARM? I feel stupid.

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murn-ga

11-20-2005 13:16:34




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 Re: No spark in the 8N in reply to Pawpaw, 11-20-2005 12:07:39  
Could this be a piece of an old light switch?



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Pawpaw

11-20-2005 17:28:13




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 Re: No spark in the 8N in reply to murn-ga, 11-20-2005 13:16:34  
I bet that's it. All the lights were disconnected when I got it and I never gave it a second thought. Makes sense, though.



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Dell (WA)

11-20-2005 21:49:27




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 Re: No spark in the 8N in reply to Pawpaw, 11-20-2005 17:28:13  
PawPaw..... ...yep, thats it, broken headlite switch.

Frontmount 8N's have a sheetmetal brackett that hangs down under the squarecan voltage regulator that holds the headlite switch.

Sidemount 8N's have a "proofmeter" that gitts innna the way and you can't mount a headlite switch there altho the voltage regulator is mounted the same place as the frontmount.

That one wire probably extends across to the "T-shaped" 3-terminal power distribution block with the "infamous ballast resistor" mounted on top of the "T" underneath yer ampmeter.

Just be CAREFULL that you don't short out that single wire.

You can use enny replacement headlite switch you care to install. Usually replacement headlite switches have at least 3-terminals (headlite and taillite) and a fuse. Iff'n it don't fitt the sheetmetal brackett, I'm certain you know how to drill a larger hole..... ....Dell

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Pawpaw

11-21-2005 18:06:22




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 Re: No spark in the 8N in reply to Dell (WA), 11-20-2005 21:49:27  
You got it right, Dell. And, now I know where that "infamous ballast resistor" is. Don't know what it does, but I know where it is. LOL. I get this thing running and then I'll turn on the lights. Thanks.



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souNdguy

11-19-2005 21:17:09




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 Re: No spark in the 8N in reply to Pawpaw, 11-19-2005 20:11:52  
Not sure who gave you the idea that a bad voltage regulator would cause lack of spark.... but it is bad advice. Only war vr will cause lack of spark.. is if it is bad.. and the battery doesn't charge.. and then dies.

If you can turn starter over.. battery isn't dead... Save charge circuit for another time to check it.. get ignition running for now. Charge circuit is for all intents and purposes a seperate circuit from the ignition...all they share is the battery and a few inches of copper..

Check power to the coil.. check to see if points open and close... a test lamp or vom is a good tool for this. As others said.. you chanige points in recent history?

Soundguy

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Dell (WA)

11-19-2005 21:16:20




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 Re: No spark in the 8N in reply to Pawpaw, 11-19-2005 20:11:52  
PawPaw..... ...ain'chure voltage regulator. The voltage regulator is a squarecan electrical device underneath the oilpressure gauge and has 4-wires connected to it. It has 'NUTTIN' to do with yer sparkies. Well, semi-nuttin. Iff'n yer voltage regulator don't keep yer battery charged, you won't have NO SPARKIES. (yer complaint)

You write..... .."Below that is a little square deal with 6 dots on the bottom and it has 1 wire to it. There are 2 lugs on that thing, but only 1 wire goes to it"..... ...This doesn't make enny sense..... unless yer frontmount 1949 has been converted to 12-volts.

In which case, (using my amazing powers of mind-reading) that may have been a convient mounting location for the 12-6volt converting resistor. And iff'n thats the case (12-volts) and only 1-wire, no wonder it don't run. The 12-6volt converting resister block should have 1-wire-INN and 1-wire-OUTT. And is MUST be in series with the "infamous ballast resistor" and the ignition coil from the ignition switch.

You write..... .."A while back, it would die after about an hour and I had to wait a couple hours before I could start it"..... .this is typical BAD IGNITION COIL characteristics. You claim you replaced the squarecan ignition coil. So make certain yer coils danglein' springy-thingy has been gently stretched so you will make certain contact with the distributor's points screw down inside the distributor body..... .....Dell

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Russ SoCal

11-20-2005 13:10:30




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 Re: No spark in the 8N in reply to Dell (WA), 11-19-2005 21:16:20  
Is the "little square deal" a headlight switch?



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Pawpaw

11-20-2005 17:31:54




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 Re: No spark in the 8N in reply to Russ SoCal, 11-20-2005 13:10:30  
I think you're right. All the lights were disconnected when I got it and I never gave it a second thought. Makes sense, though.



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old

11-19-2005 20:30:46




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 Re: No spark in the 8N in reply to Pawpaw, 11-19-2005 20:11:52  
Dead battery also means dead spark you need a good battery to have spark sence the spark comes from the battery. Jumping it right to the starter gives no power for the coil to work with so you will not have any spark. Charge/replace the battery first then let us know if it starts.



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castorriver

11-19-2005 20:21:40




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 Re: No spark in the 8N in reply to Pawpaw, 11-19-2005 20:11:52  
When is the last time you replaced the points? I"d do that next - cheap and fairly easy to do.



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