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8N won't fire

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Rick Barr

07-30-2007 07:55:43




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Hi
I recently converted my 8n to 12V. It was running fine, and would still run if I disconnected the battery, so I thought everything was ducky. Used it for a couple of days, all good, then it sat for a few weeks. Tried to start it again and battery was dead. Put in new batterr, turned over fine, but won't fire. Could I have fired the coil? How do I test that? Any advice would be appreciated. Thanx

Rick

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Ramrod

07-30-2007 11:58:58




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 Re: 8N won't fire in reply to Dunk, 07-30-2007 07:55:43  
I think you are thinking 'generator' when you remove the battery cable. If I'm not wrong, and it's not rare that I am, that would be an accepted method to test your genny for output. Remove the cable while engine is running, if it dies, genny no good.

Ramrod

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Bob

07-30-2007 08:35:55




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 Re: 8N won't fire in reply to Rick Barr, 07-30-2007 07:55:43  
NEVER pull off the battery cable while the engine is running.

WHY would you do that???

The results will likely be a fried alternator, possibly burned breaker points, and perhaps even a battery explosion.



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Rick Barr

07-30-2007 09:02:37




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 Re: 8N won't fire in reply to Bob, 07-30-2007 08:35:55  
Oh, please! You've never swapped out a battery in your truck or tractor or whatever while it was still running?? If you take the (+) cable off while it is still running, you know that your alternator is working properly.



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Rick Barr

07-30-2007 12:28:20




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 Re: 8N won't fire in reply to Rick Barr, 07-30-2007 09:02:37  
OK Ok!! Sheesh! I've doing that for 30 years and have NEVER had a problem, however your advice is duly noted and you can consider my hand slapped. That still doesn't solve my problem as the tractor was running fine for 2 full days (stopping starting etc.) I changed out the points etc this weekend but no luck. Anyway, i'm sure I'll get it running eventually



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ED-IL

07-30-2007 13:19:27




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 Re: 8N won't fire in reply to Rick Barr, 07-30-2007 12:28:20  
you can always count on these guys to tell it like it is...been a while since I was straightened out like that...ah memories



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Rick Barr

07-30-2007 13:53:42




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 Re: 8N won't fire in reply to ED-IL, 07-30-2007 13:19:27  
Ha ha!!! I thought I was tunin' my tractor, but It was me gettin' tuned!! LOL



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Rick Barr

08-02-2007 08:18:34




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 Re: 8N won't fire....FIXED IT!!!! in reply to Rick Barr, 07-30-2007 13:53:42  
HAH!!! Fixed it.....ha ha ha....I guess guys like me do know somethings HA HA...sorry old guys :-p



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souNdguy

07-30-2007 11:53:49




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 Re: 8N won't fire in reply to Rick Barr, 07-30-2007 09:02:37  
Bob's info is -VERY- correct. Removing the battery from the circuit creates a situation that is almost a 'no load' situation for the alternator. This is very hard on the regulator of the alternator and leads to excessive output voltages as the regulator has to deal with minute changes in load conditions ..IE intermittant ignition current draw..

Having a storage device like a battery smoothes out this current sourcing and allows the regulator to provide a even charging current based on average draw.

As Bob said.. by all means.. keep doing this.. he needs the business. The people who make ignition components probably don't mind either... Blue streak and tisco love people like you.

Soundguy

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Bob

07-30-2007 09:15:09




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 Re: 8N won't fire in reply to Rick Barr, 07-30-2007 09:02:37  
No, I don't do that.

I am in the alternator repair business, and HAVE made good money off of folks like you, though!

You MAY get by with it from time to time, but sooner or later you it will co$t you!

A $15.00 basic analog voltmeter is a good investment.

Incidently, have you ever witnessed a battery explosion? If you continue to pull the cables off of batteries while they are charging, sooner or later you WILL witness a battery explosion!

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souNdguy

07-30-2007 08:06:39




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 Re: 8N won't fire in reply to Rick Barr, 07-30-2007 07:55:43  
Check your wireing.. you might have the coil wired hot all the time.. or the wires on the alternator crossed.. post back after you trace your wires.

Soundguy



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A. Bohemian

07-30-2007 12:03:27




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 My Crystal Ball is Cracked in reply to souNdguy, 07-30-2007 08:06:39  
It is very difficult to guage from your posts, Bob, how much experience you have. That makes it hard to give good, efficient suggestions.

Quote: ''Could I have fired the coil? How do I test that?''

I usually test a coil by substitution. Most coil failure occurs under DYNAMIC (engine running) conditions, with very HIGH voltages induced across the coil secondary. These high transient voltages are difficult to track with a test light or volt-ohm meter. (If you happen to have and know how to use an oscilliscope, that's different; but if you knew that, the odds are you wouldn't be asking how to test a coil).

Before you go screwing and unscrewing things, check your dashboard ammeter for normal operation. It can tell you lots about the points and give you limited info about the coil.

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A. Bohemain

07-30-2007 14:47:47




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 Sorry in reply to A. Bohemian, 07-30-2007 12:03:27  
Quote: ''It is very difficult to tell, Bob...''

Sorry, guys. I meant to say ''Rick.'' Bob's post tells us how much experience he has.

I wish I could learn to type and think at the same time!



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