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Restoration & Repair Tips Board

HELP! Coil problems with 6-volt H farmall

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Author  [Modern View]
Louie Bram

08-31-2012 19:32:48
173.215.43.92



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I own a 1946 H farmall that has an original 6-volt system with a coil. For years the tractor has worked fine until one day I started it and two minutes later it died. I felt the coil, and it was hot, so I changed the coil when I realized it wasn't getting spark. two weeks later, that coil burnt out. I changed the points, plugs, condenser, cap and got another coil. Then that coil burnt out in a week. I thought maybe it was because of cheap chinese coils (the original one lasted 50 years) so I tried an IH coil. It burnt out. I can't figure out why I am burning out all these coils on the H. Does anyone have any ideas?

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Andy C

09-01-2012 08:46:29
71.246.21.89



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 Re: HELP! Coil problems with 6-volt H farmall in reply to Louie Bram, 08-31-2012 19:32:48  
You have a 6 volt battery in it, right?



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Jon Hagen

08-31-2012 19:50:13
69.26.17.61



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 Re: HELP! Coil problems with 6-volt H farmall in reply to Louie Bram, 08-31-2012 19:32:48  
On a 6V IH, not much to go wrong. Leaving the ignition turned on without starting the engine can overheat the coil, burning it up. Very high charging voltage can overheat the coil, check voltage at the battery posts with the engine running fast, it should not exceed a maximum of. 7.5 volts, 7.2 is normal..

A carbon or even metal core high voltage coil tower to dist cap wire that has burned back inside the insulation for a ways and causes the spark to jump too far, can cause the high voltage winding of the coil to short internally, wrecking the coil.

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JMOR

08-31-2012 19:44:49
72.181.173.171



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 Re: HELP! Coil problems with 6-volt H farmall in reply to oleclint, 08-31-2012 19:32:48  
Quoting Removed, click Modern View to seeI kind of doubt that you are burning them up, but then I'm not there. Are you declaring them burn up because you lose HV spark?



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Louie Bram

08-31-2012 19:59:29
173.215.43.92



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 Re: HELP! Coil problems with 6-volt H farmall in reply to JMOR, 08-31-2012 19:44:49  
I guess I think they are burnt up because a new one seems to work fine for a week or so, then doesn't work at all (at least until it gets to hot.



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soundguy

09-17-2012 12:02:33
184.233.84.164



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 Re: HELP! Coil problems with 6-volt H farmall in reply to Louie Bram, 08-31-2012 19:59:29  
i'm with jmor.. i find it hard to believe you are going thru 6v coils on a 6v machine with a 6v battery like shotgunn shells during dove season.

either the coil is staying powered.. or charge votlage is excessive, or you ar erunning some monster air gaps and making way too much high voltage potential needed for jumping..



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