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Subject: No voltage to coil

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Tom Keith    Posted 09-11-2018 at 12:19:46 [URL] [DELETE]        [Reply] [Email]  
  • No voltage to coil
  • 8N,6 volt/positive ground, front mount distributor. No voltage to coil. No voltage on regulator at "bat" terminal and thus no voltage to resistor block and thus to coil. I do show voltage at all 3 posts on generator and "field" & "arm" posts on regulator.Does this mean bad regulator. Trying to avoid removing hood so I have not tested wires coming off regulator for continuity. Thanks

    JMOR    Posted 09-11-2018 at 15:03:52 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • If you have battery voltage, there should be voltage at VR BATT terminal, regardless of running, stopped, key on or off.. If not you have a wiring problem,

    duey    Posted 09-11-2018 at 14:41:58 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • No circuit is going to 'work' unless the GROUND portion is complete... you will need to include checking for proper Ground as you troubleshoot.

    Bob in KS    Posted 09-11-2018 at 14:35:07 [URL] [DELETE]        [Reply] [Email]  
  • Re: No voltage to coil
  • “No voltage on regulator at "bat" terminal and thus no voltage to resistor block and thus to coil.”

    With engine off, source voltage to “resistor block and thus to the coil” comes from battery via the ammeter, not from bat terminal on regulator.

    There should be a wire from battery through the ammeter to the terminal block where it connects to the switch and Bat terminal on regulator. Sounds like this ammeter wire is might somehow be mis-connected to generator causing you to see voltage on generator and regulator but not on switch, coil and bat terminal

    Bruce (VA)    Posted 09-11-2018 at 14:16:50 [URL] [DELETE]        [Reply] [Email]  
  • Re: No voltage to coil
  • Is the key on?

    Check battery voltage first; 6.35 if the points are open, about half that if they are closed.

    Check the IGNITION circuit from the coil back to the battery. Coil-resistor block-key-battery side of solenoid. You're v/r is in the charging circuit. Forget about it for now.

    R Geiger    Posted 09-11-2018 at 13:25:24 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • With tractor not running you should show battery voltage to the "B" terminal. if not you have a wiring problem or a dead battery.

    Tom Keith    Posted 09-12-2018 at 09:07:04 [URL] [DELETE]        [Reply] [Email]  
  • Re: No voltage to coil
  • Thanks all for responses. Battery checks o.k. Tractor has always run as wired so I'm not thinking that is an issue. I've cleaned and checked the ground. One of responses here says I should see voltage at "bat" post on regulator and I don't show any. I have no voltage at terminal block so ignition key not in play. I still get confused with the positive ground concept, but I have the negative battery cable going to the starter solenoid and a wire from that same post that goes to the terminal block and of course neither show voltage. So I'm wanting to ask if the "bat" post on regulator should be the source of voltage to the terminal block.

    R Geiger    Posted 09-12-2018 at 13:57:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • If you have the negative battery cable going to the starter solenoid, you have it set up as positive ground. Like Bob don't worry about that.

    Bob in KS    Posted 09-12-2018 at 09:36:40 [URL] [DELETE]        [Reply] [Email]  
  • Re: No voltage to coil
  • "I still get confused with the positive ground concept," Forget the positive ground concept for now, it has nothing to do with your problem.

    "So I'm wanting to ask if the "bat" post on regulator should be the source of voltage to the terminal block" No. See explanation in my previous reply

    "I have the negative battery cable going to the starter solenoid and a wire from that same post that goes to the terminal block and of course neither show voltage." Do as Bruce said, start at terminal block and trace back to battery cable connection.

    Most problems are simple once you find them. Do logical and systematic troubleshooting and you will find the problem. It is a learning process

    R Geiger    Posted 09-12-2018 at 09:25:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • No, the batt term is not the source of voltage of the terminal, it is the other way around. You may have a testing procedure error. when you are testing batt voltage you put a lead on each batt terminal. How are you testing for voltage at the vr terminal?

    I would check for continuity of the wire going from the starter solenoid to the terminal on the VR.

    Tom Keith    Posted 09-13-2018 at 13:29:08 [URL] [DELETE]        [Reply] [Email]  
  • Re: No voltage to coil
  • Appreciate the help. I used a meter to test battery & have just been using a trouble light tester to see if/where I have "juice". Tractor has run "as wired" for years so I'm assuming problem is in a wire and/or one of the components. I have wire from solenoid going to starter button and wire going to negative post on battery ??? On my 3 post resistor the bottom post hooks to key, "bat" post on regulator & solenoid (through coil on top of resistor block). Upper left post of resistor to coil. Upper rt. post of resistor to key.
    After cleaning more connections I now have "juice" showing at coil & 2 upper posts of resistor block when the key if off (no continuity between 2 post on key). When I turn key on no juice to upper 2 posts.
    Sorry I'm such a dunce with this, but sure do appreciate all the help.

    JMOR    Posted 09-13-2018 at 15:38:26 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • I expect that you think OFF is ON and ON is OFF with your ignition key.

    Tom Keith    Posted 09-14-2018 at 07:39:48 [URL] [DELETE]        [Reply] [Email]  
  • Re: No voltage to coil
  • I was thinking the same thing. SO when I have continuity between the 2 posts on ignition key (no juice to upper 2 posts on resistor bar) that is "OFF" on ignition key.

    JMOR    Posted 09-14-2018 at 07:56:42 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • continuity definition: uninterrupted connection.

    SO when I have NO continuity (an INTERRUPTED connection) between the 2 posts on ignition key (no juice to upper 2 posts on resistor bar) that is "OFF" on ignition key.
    I agree with statement as modified.

    Tom Keith    Posted 09-14-2018 at 13:01:37 [URL] [DELETE]        [Reply] [Email]  
  • Re: No voltage to coil
  • Thanks again for all your help.
    Agree with your definition of continuity. With wires disconnected from key confirmed key is working and "directions" for on vs. off. When key is OFF I have juice to upper 2 posts on resistor bar. Turn key "ON" no juice. Have positive ground & have clip end of trouble light connected to negative post on battery.

    JMOR    Posted 09-14-2018 at 14:15:54 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • Well, there is the problem. Connect the trouble light clip to chassis ground,,,,,,in you case that is the battery POSITIVE/grounded terminal.

    Tom Keith    Posted 09-16-2018 at 11:45:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: No voltage to coil
  • Thanks so much. You are a life saver. Turns out my problem must have been some of my connections were not clean and obviously my lack of understanding the positive ground. When I connected trouble light to positive grounded terminal everything checks out.

    JMOR    Posted 09-16-2018 at 17:56:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: No voltage to coil
  • You are welcome. Most things in life are 'learning experiences'. :)

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