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Subject: 841 12 Volt Conversion Questions

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Jerry    Posted 08-26-2020 at 11:34:40 [URL] [DELETE]        [Reply] [Email]  
  • 841 12 Volt Conversion Questions
  • After a full tune up and a couple of days trying to get the tractor to run smooth, I believe I have an intermittent coil issue. I got the engine running smooth this morning for a couple of minutes, then it sputtered, spit, etc and died. I immediately checked for power between the coil and the distributor on the low intensity circuit and it was dead. A check prior to the start up had power.

    So now my basic question is what coil do I need? I have limited knowledge of electrical circuitry, so here are some data points that may help a knowledgeable person:

    1)Tractor has a 12V battery
    2)Between the switch and the coil there is a resistor. I measured 1.5 OHMS. I do not know what that resistor is for, but answer may be in next point.
    3)I have a 12V, can coil. It has been painted over but 2 items left visible. 12 Volt and Use with External Resistor Only. The coil has marked plus and minus posts and a high intensity plug.

    So is this a NORMAL 12v coil that i can go to NAPA, etc and pick up or is there something else i need to know to get the right coil.

    Tim Daley(MI)    Posted 08-26-2020 at 12:41:39 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 841 12 Volt Conversion Questions
  • Jerry-

    "...I have limited knowledge of electrical circuitry...". Why didn't you seek out the manuals and the electrical system before you tried mucking around with it in the dark. 99.925% of all non-starting issues are due to incorrect wiring. If you don't know what it is before you start, how can you think you just start changing out parts. My post below from the OEM Owner Manual shows the electrical diagram - 6V/POS GRN setup. So, let's start over. Do you have a 12V battery? If so, do you also have an alternator or is the OEM generator and VR in the circuit? If you want to go with 12V, then remove gen and VR, install alternator, go with 12V coil, dump any external resistors, and use this diagram. Don't buy any more parts until it is needed. Don't assume. I am not trying to belittle you, just trying to help -you asked. Bruce and JMOR are the electrical experts here, Ian only pass on what I learned from them.


    Tim Daley(MI)

    Bruce(VA)    Posted 08-26-2020 at 11:54:16 [URL] [DELETE]        [Reply] [Email]  
  • Re: 841 12 Volt Conversion Questions
  • As Jesse said.....you do not know if you have a coil problem and chances are you don't.

    With the points open, you should see battery voltage (12.65 volts) at the coil and distributor.

    JMOR    Posted 08-26-2020 at 11:48:45 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 841 12 Volt Conversion Questions
  • About 99.44% chance that the problem is NOT the coil. They are almost always suspected because of general suspicion of the unknown.
    "power between the coil and the distributor " Well, voltage at that point depends on whether points are open or closed. Which were they?

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