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Show Parts for Model:

6volt IH Farm Truck

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12-01-2012 17:51:49

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Have 1940 IH truck that I use for hauling firewood. Last weekend I was driving between the woods and the house and heard an arcing noise then the truck died. Turned out the battery cable had come loose and bounced off (disconnected). Arced the post up pretty goood.
Wouldn't start again.
Have worked on it some and found the following. - 6 volts to the coil, - points will spark (bright blue) when I open and close them with a screw driver (when the lobe is set where they should be closed) - No spark at the plugs (best I can tell trying to crank it with a screwdriver jumping the starter button on the firewall. -Testing for continuity I have continuity from the plug inside the center of the cap to the coil end of the coil wire.


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12-02-2012 21:08:23

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 Re: 6volt IH Farm Truck in reply to dmiller, 12-01-2012 17:51:49  
The battery was discharged enough to prevent sparking from low voltage when cranking, but not when stationary. No surprise there, a lead acid battery will hold good enough voltage to spark when it is lightly loaded, and drop into no spark when a 350 amp load is applied. Jim

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12-02-2012 19:54:21

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 Re: 6volt IH Farm Truck in reply to dmiller, 12-01-2012 17:51:49  
Thanks for all the help. I was ready to go to town and buy a condesor on monday.
Had put it on the charger overnight, tried it again this afternoon and it started.
Not sure why it wouldn't all week but did today. Thankful, dumped the load and parked it inside.

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12-02-2012 12:54:35

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 Re: 6volt IH Farm Truck in reply to dmiller, 12-01-2012 17:51:49  
Not to sound too dumb but is your rotor turning? Len

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12-02-2012 10:18:18

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 Re: 6volt IH Farm Truck in reply to dmiller, 12-01-2012 17:51:49  
Pull the coil high voltage wire out of the distributor cap. Put it within i/8 inch of the engine block (tuck it in so you can let go of it and it will stay in place.) now with the key on, move the points from closed to open to get that blue spark at the points. If no blue spark at the coil wire to block, replace the coil. Jim

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todd Hamilton

12-01-2012 19:25:57

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 Re: 6volt IH Farm Truck in reply to dmiller, 12-01-2012 17:51:49  
Get a helper to turn it over and watch the points with distributor cap off. If no blue arc when points open you will have no spark. Short could have damaged coil to where it will make some arc but not enough to fire the plugs. Try changing the condensor first

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12-01-2012 19:43:20

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 Re: 6volt IH Farm Truck in reply to todd Hamilton, 12-01-2012 19:25:57  
Check the coil wire for fire,if the coil wire is firing, then look to the rotor and cap.

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