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70 gas-what's going on here?

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Dave 2N

08-17-2000 05:11:34




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Folks-any ideas? My 1954 70 gas has a Delco-Remy 12 volt coil that is slightly cracked but works. Decided it was time to replace it. Got one from my JD dealer (not a Delco-Remy) but same number, installed it, the tractor runs a few minutes and then shuts down. reinstalled the old coil and it works OK. Help! Thanks.




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clooney

08-17-2000 13:20:18




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 Re: 70 gas-what's going on here? in reply to Dave 2N, 08-17-2000 05:11:34  
Dave, are you sure it needs a 12 volt coil? Maybe a one time someone has converted it to by-pass starting from the LP 70. With it running check the voltage at the coil negitive terminal (you did hook the wire from the ignition SW to the neg. terminal of the coil & the wire going to the dist to the pos. terminal of the coil didn't you?)the voltage after it runs a few minutes should be 12+ volts, if it is 6-8 volts you need a 6-volt coil. I see in the parts book that the original coil has been subbed to a new number so maybe there an internal resistor in the new or old coil. You might find an original coil at a scrap yard. Are you sure it is running out of spark to make it quit? If you solve this problem post the findings please.

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John T

08-17-2000 08:43:10




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 Re: 70 gas-what's going on here? in reply to Dave 2N, 08-17-2000 05:11:34  
Dave, shut down after warm up can be a sign of a bad coil, but dern if thats new its hard to see why its happening. Other causes of shut down on warm up could be a condensor (worn or carboned up points also have higher resistance after they are warm), but since it runs fine with old coil and not new one, it appears the new coil may be defective. Does that tractor have a balalst resistor?? Some coils have an internal ballast and some dont but the total DC resistance of any ballast and a coil shuold be around 3 ohms or approximatley 1.5 each. I would return it to JD decribe the problem and see if they will give you another one and try it and post back. Do you know what shape or age the points and condensor are in?? If they are old or bad, I would change them out and see what happens after warm up. John T

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Gman

08-17-2000 23:52:15




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 Re: Re: 70 gas-what's going on here? in reply to John T, 08-17-2000 08:43:10  
I have a 70 LP STD, I restored it,I purchased me a parts manuel and it's got a dandy wiring diagrams in it,you might want to check it out saves a lot of time and guess work. just a ideal Gman



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Dave 2N

08-17-2000 10:24:01




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 Re: Re: 70 gas-what's going on here? in reply to John T, 08-17-2000 08:43:10  
John-
Points, plugs, condenser, wires, distributor cap were new in June and this tractor has only been to a couple of fairs and pulled twice. First new coil we thought was defective but JD to this point not wanting to take it back(electrical parts policy.) Got another new coil form CT like a lot of the guys in our club use and same problem so as of now, the old coil is back on and it's running OK. Old coil had internal resistor like the new ones. JD service says that according to the tractor's serial #, it wasn't supposed have an external ballast resistor. Hard to believe two defective coils???
Thanks for the help.

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John T (Is coil polarity right)

08-17-2000 13:04:02




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 Re: Re: Re: 70 gas-what's going on here? in reply to Dave 2N, 08-17-2000 10:24:01  
Dave, for a positive ground tractor, the coils - side gets power from the switch while the + side goes to ground via the distributors points. They still run backwards, but not quite as well. I agree two bad coils is questionable for sure. John T



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