Scout 800 New Harness/Coil & Neg Cable

Discussion in 'General IH Tech' started by 76rallye, Sep 20, 2019.


  1. 76rallye

    76rallye Farmall Cub

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    Just completely rewired my 1970 Scout 800 with a new North West Harness. Is the following normal (have not started engine yet)
    1. Negative side of Battery Cable warm. also, battery is new, polarity is not reversed and cables are new as well. I measured from negative side to engine block gnd with headlights on and measure 0.345 volts.
    2. 12v at one side of ballast resistor and 9v at opposite side leading to coil?
    Thank you
     
    Last edited: Sep 20, 2019
  2. 76rallye

    76rallye Farmall Cub

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    Wanted to add to my post that Turn signals, horn, headlights, hazards, heater fan, side markers and electric wipers all work as expected. Tail lights work but I still need to figure out what’s wrong with the rear brake lights.
     
  3. Don B

    Don B Binder Driver

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    I don’t think the negative cable should be warm period. Sounds like there is a large drain on the system. It’s a big cable and would take a lot of load to raise the temperature. Be very careful, I had a coil wire completely fry as it always had power to it...very dangerous! Maybe you should unplug a circuit at a time until you find the fault. Do the coil first. I’m not an expert on wiring but use a lot of caution here, please.

    Don B
     
  4. RinTX

    RinTX High Wheeler

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    Cable should not be warm. If it is a good amount of current is flowing through it. Quick test would be is there spark when disconnecting the ground? There should not be.
     
  5. 76rallye

    76rallye Farmall Cub

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    As I was trying to figure out why my rear brake lights were not working, I grounded the socket to see if I had a poor ground. I noticed a small spark when when the socket touched vehicle ground. So it looks like I do have an issue somewhere. Also, loosening and reconnecting the negative battery cable does cause a spark as well. Also tried to turn engine over but nothing. I’ll start looking at the starter perhaps and work my way back. Thanks for your help
     
    Last edited: Sep 23, 2019
  6. 76rallye

    76rallye Farmall Cub

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    UPDATE:

    I found the issue with my Rear Brake/Tail Lights and why I was getting a spark when I touched vehicle ground. At first I thought it was the rear bulbs as the filament contacts on the bulbs were very flat. I bought new bulbs (PN 1157) which had a significantly higher contact point but still had the same results (No Tail lights, brake Lights always ON and turn signal intermittent). My rear light housings I grounded so I knew that was fine. Wiggling the actual spring loaded contacts changed my results. I then bought some new filament pigtails (PN Dorman 85801) and problem solved. Apparently it was causing a short.

    During this hunt, I also discovered that my auto shifter was missing the flag (not sure what it’s actually called) that engages the Neutral Safety Switch. In addition that plastic portion on the switch where the flag resides in was cracked. Bought a new Neutral Safety Switch (PN Borg Warner S-277; Also used on Rambler & Jeeps), made the metal flag and now have reverse lights and motor turns over.
     
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  7. CowboyBob

    CowboyBob Farmall Cub

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    Good information for future reference. Thanks!
     
  8. Randall Barringer

    Randall Barringer Y-Block King

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    Nicely done, sir.
     

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