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Subject: 1952 6V Side Mount Resistor

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Matthew    Posted 01-14-2018 at 00:04:45 [URL] [DELETE]        [Reply] [Email]  
  • 1952 6V Side Mount Resistor
  • I am working on my grandpa's 1952 8N that has the 6 volt positive ground system with a side mount distributor. It is not getting any spark at all. I have checked voltages and I am getting a little more than 6 volts on both the positive and negative terminals of the coil with the ignition turned on. I am trying to figure out if I need to have a ballast resistor between the ignition switch and the coil, right now the wire runs directly from the ignition switch to the positive + terminal on the coil. I tried reversing the coil and connecting that wire to the negative terminal instead, but still no spark.

    Bruce (VA)    Posted 01-14-2018 at 08:13:56 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1952 6V Side Mount Resistor
  • As Tim said, the first thing you need to do is get the wiring diagram for your tractor. Next, order the manuals. You have a 66 year old tractor; no matter how good of a mechanic you are, guess work will get you in trouble.

    Re coil polarity, see tip # 33.

    Re no spark, confirm that you have voltage to the coil. Battery voltage, points open. About half that if the points are closed.


    Do you have battery voltage across the points when they are open? (with the points open, put one probe on one side of the points & the other probe on the opposite side of the points) Verify the gap on the points at .025. Then, dress the points by running a piece of card stock or brown paper bag through them. New points sometimes have an anti-corrosive dielectric coating on them & old points can corrode or pick up grease from a dirty feeler gauge or excessive cam lubricant. (I always spray my feeler gauge blade off w/ contact cleaner.) Make sure you have voltage across the points, as in past the insulator on the side of the distributor. That is a very common failure point on sidemounts, along w/ the attached copper strip. It's hard to find a short there because it is usually an intermittent . So 'wiggle' the insulator & the copper strip a bit when you are doing your checking. If you find the short there, the Master Parts catalog lists everything you need on page 154. You can make the strip and you could also make the insulators as well. But, somethings are just easier & in the long run cheaper to buy. Get the strip, 12209, screw 350032-S, 12233 bushing & 12234 insulator & just replace it all.


    If you just replaced the rotor & lost spark, put the old one back in. Insure that the rotor fits firmly on the shaft & that the little clip is there. Make sure the distributor cap is not cracked, doesn’t have gouges in it from the rotor or brass shavings & doesn't have carbon tracks. Check continuity on the secondary coil wire. Make sure it is firmly seated in both the cap & the coil. Next, remove the secondary coil wire from the center of the distributor cap, turn the key on & crank the engine while holding the end of the wire 1/4" from a rust & paint free spot on the engine. You should see & hear a nice blue/white spark. If not, you have a bad coil or condenser. Just put the old condenser back in to eliminate that as a possibility.


    Post back w/ results; I'll be interested in what the problem was.

    Matthew    Posted 02-03-2018 at 11:21:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1952 6V Side Mount Resistor
  • Bruce,
    I am getting battery voltage with the points open, but I am getting no voltage when they are closed. I have replaced the coil and condenser with new ones but still no spark.

    Matthew    Posted 01-14-2018 at 09:31:24 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1952 6V Side Mount Resistor
  • Thanks for the information Bruce, I will be making the trip to work on it again here in a couple weeks and I will check all of the things that you have here and I will post my results. I do have the shop and owner's manuals and I did download JMOR's wiring diagram before I got started. I tried switching the wires on the coil because it showed the wire from the terminal block running to the negative side of the coil. I am definitely a newbie to all of this and I greatly appreciate that you all take the time to answer questions. Thank you!

    36 coupe    Posted 01-14-2018 at 10:45:23 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1952 6V Side Mount Resistor
  • Go back and read the manual.If you have the same voltage on both side of the primary the points are open or the copper strip is broken.

    Tim Daley(MI)    Posted 01-14-2018 at 05:12:48 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1952 6V Side Mount Resistor
  • NO! The Angle Mount (Side) Distributor does not use a ballast resistor. Go to our HOW-TO's here, Electrical subcategory, WIRING PICTOGRTAMS by JMOR, download a copy, or click on the LINK at the bottom. Scroll down to wiring for side mount, after s/n 263844. There is only a terminal block, no ballast resistor in the circuit. Best to know what you're doing instead of just 'swapping' wires around and guessing.


    Tim Daley(MI)

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