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Subject: Electrical harness, ignition problems

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Marty    Posted 05-22-2018 at 16:16:26 [URL] [DELETE]        [Reply] [Email]  
  • Electrical harness, ignition problems
  • As far as I can tell, I have a 1950 8N, with side distributor, that has already been converted to 12V. It was running fine, when the battery shifted in its tray and started arching against the frame, at which point it fried some wires and probably other stuff. In my attempt to put things right, I removed the cobbled mess of wires with the 400 different colored wires that were spliced together, and bought a new ignition switch and wiring harness. I'm using the attached diagram to guide me and I took a picture of my block and new switch. Any thoughts? The starter is good on the bench and even tried jumping it in the tractor and it turns it over fine. From what I can tell, I have it wired correctly according to the diagram. What am I doing wrong!? Any help is very much appreciated

    Tim Daley(MI)    Posted 05-24-2018 at 05:01:02 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Electrical harness, ignition problems
  • HiYa Marty-
    Depressing the starter button and not even a click would suggest a dead battery and/or bad wiring. The fact that Bruce(VA) stated about wire colors and electrons must be heeded. Unless you get one of the new, exact-as-original wiring harnesses made with the original cloth covered and color codes, you cannot go by any new type wiring harness. Even so, continuity must be tested with a multi-meter device to verify -don't guess. One wrong connection and you may let the smoke out of something. I'd start with battery. Ignore whatever colors the wires are -verify logically. You say the battery shifted and started arcing against the frame. If the terminals on the battery are not on the top of the unit, you don't have the right battery -avoid side posts style. By jump starting your tractor you are only running off the supply side/donor battery, not the tractor battery, and, could possibly mean your tractor battery is dead Get it checked at a starter/alternator shop or auto parts store. Once battery issue is resolved, get it fastened down in the battery tray so it doesn't move. Many fellas take the battery hold downs off and that is a mistake IMHO. K-LaRues' wiring diagram is correct, but there is a 3-wire alternator diagram to help. Finally, avoid just replacing parts with new until root cause problem solving determines if defective. The 1N5408 diode in-line as shown is a common part, but Radio Shack is all but defunct, so any electronic parts supply house will carry it. Diodes are polarized, meaning one end is positive and the other end is negative and it matters which way it is connected in the circuit.

    Tim Daley(MI)

    Jim In Montana    Posted 05-23-2018 at 13:39:52 [URL] [DELETE]        [Reply] [Email]  
  • Re: Electrical harness, ignition problems
  • Be sure and check and clean every terminal and connection point. Make sure they are clean and bright. Clean with wire brush or sand paper. Check your battery cables and make sure they are clean where they attach. Any corrosion can cause a break, and stop you cold.
    Also, several have mentioned, and i will join them, be SURE it is in Neutral before trying any of these tests as you try to start it. Many have been hurt or killed as they WILL start in gear.
    Good luck,

    Bruce (VA)    Posted 05-22-2018 at 16:58:42 [URL] [DELETE]        [Reply] [Email]  
  • Re: Electrical harness, ignition problems
  • What is your problem?

    No spark?

    Do you have 12v to the coil? The distributor? The points?

    Electrons are blind & do not pay attention to the color on the wires. Trace each wire w/ a multimeter.

    Jim    Posted 05-26-2018 at 02:46:25 [URL] [DELETE]        [Reply] [Email]  
  • Re: Electrical harness, ignition problems
  • When you guys mention something is facing the block or away from the block are you meaning closest to or farthest away? I am not sure what facing means. Thanks

    Marty    Posted 05-22-2018 at 17:23:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: Electrical harness, ignition problems
  • No turning the starter over. Turn the key, push the button and nothing.

    R Geiger    Posted 05-22-2018 at 17:50:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Electrical harness, ignition problems
  • The red wire that goes to the push button should be going to the small terminal on the solenoid. if you ground out the small terminal the starter should turn over. make sure the transmission is in neutral before you try this. if you have the correct solenoid the small terminal should point towards the block. It will not work if the small terminal is facing away from the block.
    keep it safe

    Marty    Posted 05-23-2018 at 07:38:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Electrical harness, ignition problems
  • I think I have everything as you described. The red wire from the push button goes to the inboard terminal of the solenoid (there is only one small terminal). The push button will not push unless its in neutral. The ignition switch, wiring harness and solenoid are all brand new, and the starter was bought last year. When running jumper cables from the battery to the starter, it turns the engine over. I have to have it wired wrong for some reason. There's only 5 wires!! I'm a little baffled at this point....

    JMOR    Posted 05-23-2018 at 09:16:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Electrical harness, ignition problems
  • Possibly wrong solenoid. There are many variations & some different (electrically) appear identical externally. From this diagram, you should be able to measure Continuity & or voltage and determine whether it is correct unit or not. You might just apply voltage (instead of ground)to the small solenoid terminal & see if it activates as a quick check to tell you that it is wrong type. BE SURE transmission is in NEUTRAL so as not to run over your self.

    Marty    Posted 05-23-2018 at 10:33:06 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Electrical harness, ignition problems
  • Thanks, I'll troubleshoot this tonight after work and see if its the culprit.

    R Geiger    Posted 05-23-2018 at 08:53:12 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Electrical harness, ignition problems
  • If you still have your old solenoid, I would try it. New parts have been known to be bad. assume you have a small wire hooked to the solenoid on the same post as the battery cable. I have heard of solenoids being wired wrong so that the small terminal would have to face away from the block tho.
    It really sounds like you have it wired correctly.

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