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coil

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bottomboard5

10-29-2005 06:09:10

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Can I just ask for any 12 Volt coil when I replace? Can advance auto parts tell if a coil is "going bad" as my engine shuts down after 45 minutes of use after running good? I"ve been told to check and maybe replace the coil...thanks..

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Dale in Ar.

10-29-2005 18:32:51

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Re: coil in reply to bottomboard5, 10-29-2005 06:09:10

I was told by a parts man who had been in the parts business for over 30 yrs. that I know of and he told me that all points and condensers run on the same voltage and resistance.The resister(either built into the coil or out before the coil) cuts down the voltage to,I believe,3 volts or there abouts.I may have some things turned around but I put a 12 volt coil with internal resister in my Super C and it still has the 6 volt distributor with the same guts as when it ran on 6 volts.I have not had any problems in over a year after putting the 12 volt coil on.

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RAB

10-29-2005 09:07:00

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Re: coil in reply to bottomboard5, 10-29-2005 06:09:10

As John T says, check out the reason for it stopping, before you do anything else.
If you have a good, strong, blue spark, you are simply wasting your money, time and effort in changing the coil. An even more expensive way would be buy another tractor, fit that suspect coil, and see if the problem occurs still! I know I would rather do a few simple checks first!!
RAB

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John T

10-29-2005 06:26:38

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Re: coil in reply to bottomboard5, 10-29-2005 06:09:10

About any generic 12 volt coil having approximately 2.5 to something over 3 ohms primary winding resistnce (between lil + and - terminals) will work provided its a full 12 volt rated coil. I.E. DO NOT get one that is labeled "12 volts for use with an external ballast resistor" cuz thats really a 6 volt coil and you would need to also buy n use an external ballast. You need 12 volts, NO external ballast required.

Before buying a coil I would try a much cheaper condensor first, cuz they can go bad once warmed up !!!!! ! If the points were carboned up n burned they can increase resistance with heat and fail also. So if shes not had new points n condensor lately and theres any doubt, I would try that first before a new coil.

NO, I doubt Advance Auto can test a coil. They would need a hi pot breakdown tester and I seriously doubt they have one. To really test a coil you need to get it up to operatign temperature and then have high voltage present cuz its the high voltage secondary that can fail.

Are you sure its the ignition thats quitting instead of fuel starvation???

John T, retired electrical engineer.

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Bottomboard

10-30-2005 05:36:33

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Re: coil in reply to John T, 10-29-2005 06:26:38

Well...I purchased a $11 coil at Advance yesterday... ran the tractor (all day long) without any cutoffs, etc....I got lucky I guess. thanks everyone for your help

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