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Subject: 8n spark

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Mike lavigne    Posted 01-06-2020 at 16:57:11 [URL] [DELETE]        [Reply] [Email]  
  • 8n spark
  • I tuned up my 8n with a point gap at .015,new coil,condenser,cap,and rotor now I get power to the coil but not the plugs.please help me

    K.LaRue-VA    Posted 01-07-2020 at 09:35:13 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n spark
  • Why a "new coil"?

    Front mount conversions are picky about matching the correct coil with the factory or an add-on resistor. The new coil has to be the exact same type as the old one, unless you check and make sure the resistor(s) are correct for the coil you are using.

    Every time the points are replaced, everything inside the distributor has to be checked and verified functional. Make sure there are no loose wires or copper strip that has been broken or bent and going to ground in there. Turn the distributor and make sure you can see the points open and close both visually and with a test light or ohmmeter.

    Check points open and points closed voltage at the top of the coil as Bruce suggested. Give us those values and we can give more detailed advice.

    Bruce (VA)    Posted 01-06-2020 at 17:42:08 [URL] [DELETE]        [Reply] [Email]  
  • 8n spark
  • 6v or 12v?

    Front or side distributor?

    What is the exact voltage at the coil with the points open?

    Mike lavigne    Posted 01-06-2020 at 18:07:25 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n spark
  • It is a frt mt.

    Tim Daley(MI)    Posted 01-06-2020 at 18:32:46 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n spark
  • 6V or 12V?

    Tim Daley(MI)

    Mike lavigne    Posted 01-06-2020 at 18:41:18 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n spark
  • Sorry it is a 12 volt conversion

    Tim Daley(MI)    Posted 01-07-2020 at 06:31:08 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n spark
  • Mike-
    We have an excellent wiring diagram with all the ways to wire these N's whether 6V/POS GRN or as a 12V switch over job in our HOW-TO's forum - see LINK below. Download it and print a hard copy for yourself as a guide. I suspect you have a wiring issue. Using the pictogram, confirm your wiring meets the criteria shown for your front mount 8N 12V Conversion, no shortcuts. You say you have 26 years with your 8N so we will assume you know how to properly set the front mount timing and install the unit with the offset tang. Misalignment of the cam/tangs will bust the housing base, but you knew that already. Points are set to .015" and must be timed correctly as well. Next, verify you have a good battery, don't guess, have it tested on the machine at a starter shop or auto parts store. It doesn't matter if the battery is 6 months or 6 minutes old, if it won't sustain a full charge under load, it fails. Batteries can be bad out of door at the store. The cheaper off-brand units are prone to be most susceptible to poor life spans as well. Start with a good power plant -the battery; it's the heart of any electrical system. Battery cables are important as well. You need 12V style cables -like on your car -and toss the heavier 6V cables. Then before applying power, verify that wiring is correct. A 12V setup on a FM uses the OEM Ballast Resistor. Do you have one? Is the VR removed from the circuit? Is the coil 6V or 12V? If 6V you need to add an in-line ceramic 1-OHM resistor in the circuit (not shown in pictograms) but is not used if you have a 12V coil. Once the Ford front mount distributor is tuned-up correctly and tested, install and then can proceed with the spark test. See if these suggestions help at all. Incorrect wiring is the bulk of all non-starting issues whether 6V/POS GRN or 12V/NEG GRN. Start with these suggestions. Brice(VA) has a list of "75 Tips For N Owners" you can also download and use in your shop. Bruce and Farmer Dan (dansden@usa.com) also have a detailed explanations on how to tune-up and time the front mount distributor. See if these suggestions help you.

    Tim Daley(MI)

    Bruce (VA)    Posted 01-06-2020 at 18:46:06 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n spark
  • What is the exact voltage at the coil with the points open?

    Mike lavigne    Posted 01-06-2020 at 19:24:22 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n spark
  • How do I check the voltage on a frt mt.

    Bruce (VA)    Posted 01-06-2020 at 19:42:50 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n spark
  • Check the voltage at your battery. It should be 12.65 volts.

    Then, turn the key on and check it at the top of the coil. If the points are open, you should see exactly the voltage you saw at the battery. If the points are closed, you should see about 9 volts or so. Bump the starter until you get the exact voltage for points open and points closed.

    Post back w/ results.

    If you have a good battery and see the correct voltage, the problem is inside the distributor.

    JMOR    Posted 01-09-2020 at 14:42:57 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n spark
  • Bruce, that sounds like, "do you still have the box that your tractor came in?" OK, then put it back in the box & return it. What do I give them as a reason for return? Tell them that you are too.................
    You figure it out!

    Mike lavigne    Posted 01-06-2020 at 20:11:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n spark
  • Battery is in good shape voltage is good it is only 6 months old. I have had this tractor for 26 years and have always Benny's able to fix it but I am stumped?

    Bruce    Posted 01-06-2020 at 20:33:07 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n spark
  • I'll do my best to help you, but I honestly do not like to play guessing games when I'm trying to fix a piece of equipment.

    Telling me that the voltage is good and the battery is 6 months old does not give me any information I need to help you.

    If you are not interested in determing the voltage at the top of the coil, perhaps someone else more skilled in troubleshooting than I am will be able to help you.

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