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Subject: Tractor Dies

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D Grass    Posted 02-28-2018 at 21:25:17 [URL] [DELETE]        [Reply] [Email]  
  • Tractor Dies
  • Rewire a old 1948,8n,from 6 volt to 12 volt,tractor starts but when i take the
    positive cable off the batterie she dies,and the amp meter want reg, got some wires
    wrong i guess.This old tractor has a - ground now.Hummm, any ideals... See Ya

    steveVa    Posted 03-01-2018 at 12:41:13 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • A generator will keep a tractor running if it is good and wired correctly when you disconnect the battery wile running, but why??
    An alternator will not keep the tractor running unless wired specially to do that with the battery disconnected. My understanding is that you will fry your Alternator if you disconnect the battery while running. And the Tractor will shut down as well.

    K.LaRue-VA    Posted 03-01-2018 at 12:05:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • Why did you take the battery cable off? If engine starts after a rewire, and amp gauge shows charging until the battery is back to a full charge, and you don't see any smoke, you are done, everything is good. Move on to the next project. Removing a battery cable at that point is only going to show how big a spark you can make. Arcs and sparks are very bad for electronics. If an alternator or new breakerless ignition module were included in the rewire, both can be instantly fried by the arcs and sparks this "test" causes. I don't know of any useful information this test would ever show. Alternator or generator makes no difference as far as the usefulness of this test. To my knowledge the only people who ever got any benefit from this test would be dishonest mechanics who wanted to sell parts that were not needed. A better test would be to hook up a voltmeter. If you see something in the neighborhood of 14 volts for a 12 volt system with the engine running, that is good.

    rgeiger    Posted 03-01-2018 at 10:04:05 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • When I was a kid, step dad had a grey tractor and I was plowing and and I killed the engine when the plow hit something, tried to restart, nothing, started checked things out and found a battery cable had come off. put the cable back on and she fired right up, so I was running off the 6 volt generator.

    what do you mean amp meter want reg? On my two with 12 volts the amp meter only show a charge right after starting, and it drop back as soon as the battery is charged.

    Hope you did not fry your alternator.

    Bruce(OR)    Posted 02-28-2018 at 23:47:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • Taking off cable with a alt causes full field. Genny's designed to run with no battery. Alts just max out amps and volts and fry things possibly. Chances are alt/VR are fried. Bench test needed.

    36 coupe    Posted 03-01-2018 at 19:11:54 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • If you disconnect an alternator from its battery and apply 12 volts to its field it will turn out 110 volts dc.I used this to run a skil saw at camp.Still have the adapter under the shop bench.I used a 5 hp Briggs to do it.I will remind you the 1/2 internet info is dead wrong.

    36 coupe    Posted 03-01-2018 at 05:17:29 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • A generator will run up to 20 volts if the battery gets disconnected.Happened to the 36 right after I bought it.Headlites got real bright and burnt out.In cold weather the generator can run away because the cold battery doesnt load the generator soon enough right after starting.Theres a note on this in Victor Pages book on the Ford V8 on the problem.A generator will run away if the battery gets disconnected.A Ford tractor with a 3 brush generator can burn out headlites if they are switched on right after stating the engine in cold weather.Bruce is WRONG this time....

    Bruce(OR)    Posted 03-01-2018 at 23:54:47 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • The alternator makes alternating electricity. It uses diodes to convert it to direct current. That being the reason it is called an "Alternator". The alternator uses constant reference voltage and then diodes to convert alternating electricity to old fashioned direct current. I have seen an alt disconnected with the engine running and generate about 400 amps at 27 volts.
    That simplistic generator does just that. It generates. It does not need a reference voltage to "generate".
    So if the battery gets pulled on an alt, the alternator will full field and can possibly blow out the electrical system. Been there, done that. Same trick on a generator and they can keep running. Time for me to take my wrong self to bed. 147 day's to retirement from work and then maybe I can work on something else. Perhaps more so, "Volunteer".
    God Bless!!

    36 coupe    Posted 03-02-2018 at 04:03:24 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • Sorry but you are wrong again.The 110 v adapters were sold by many companies in the 70s.Chrysler used a simple 2 rate relay to control voltage,The Chrysler alternator was easy to work on because the brushes could be replaced with out pulling the alternator off the car.The silicon diode made the alternator possible in autos and trucks.The later built in regulators would fail and batteries would get boiled out and bulged.My wife had 2 GM cars with boiled out batteries.I repeat, a generator will increase voltage if the battery get disconnected.

    36 coupe    Posted 03-02-2018 at 04:38:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • Do a search on 110 volt auto alternators.Plenty of info on the web.Know that DC is hard on power tool switches if you run them on DC.Makita had DC ratings on tools.Some posts say the output of convertions is AC not so.Alternators produce 3 phase 400 cycle AC that is rectified by internal diodes.I spent 50 years fixing alternators ,generators and starters in my shop here in Maine,plus 15 years in Mass working on farm equipment and radio and Tv.Worked for a Ford dealer when the 57,58,59 Fords were new.Did electric motor repair too.

    Bruce(OR)    Posted 03-04-2018 at 00:11:13 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Tractor Dies
  • I am glad you spent 50 years. Alternators use reference voltage. You can research it on wikipedia if your so inclined. I am done. Have fun. . . .

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