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  1. #21
    Elite Member JC-jetro's Avatar
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    Kansas
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    Ford 1700, Kubota MX-4700

    Default Re: Reversed battery polarity on 8N

    Quote Originally Posted by Soundguy View Post
    shouldn't be odd if you do electronics for a living.

    you likely closed the cutout, which polerized the genny..

    no need to read the reg to polerize an a circuit system.. just jump bat to armature and go.

    easy to tell what circuit type if you don't know by looking at the vreg field control, since it connects the field coil to ground via a vibrating contact.. has a bias resistor from fld to grns onthe bottom of the reg too.

    soundguy

    soundguy
    Soundguy,

    You are indeed a learning/teaching smorgasbord. You need to start charging for it

    JC,
    Ford 1700, 2wd.
    Kubota MX-4700DT, Gear transmission with LA 884 loader, Q/A and HD bucket.
    60" Woods Rotary Cutter, home made (3-pt boom and a Row Hipper) ,King Kutter( 5 ft Tiller,Middle Buster,Single Row Cultivator,Carry-all, 5 ft blade, 6 ft Landscaping Rake ,30" Dirt Scoop and a 4'x4' Drag Harrow)

  2. #22
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Reversed battery polarity on 8N

    naa.. these old tractor electrical systems are just too simple.. about 3' of wire.. and a few switches, couple balls of copper and other assorted bits...

    soundguy

  3. #23
    New Member
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    Sapulpa, OK
    Tractor
    1949 Ford 8N

    Default Re: Reversed battery polarity on 8N

    Quote Originally Posted by Soundguy View Post
    shouldn't be odd if you do electronics for a living.

    you likely closed the cutout, which polerized the genny..

    no need to read the reg to polerize an a circuit system.. just jump bat to armature and go.

    easy to tell what circuit type if you don't know by looking at the vreg field control, since it connects the field coil to ground via a vibrating contact.. has a bias resistor from fld to grns onthe bottom of the reg too.

    soundguy

    soundguy
    Well, I was meaning to say it seems odd to most people, and a little to me because I do electronics as in the internals of monitors, power supply's, and just general things, but I haven't messed much in the old car/truck/tractor world with generators.

    I tried to jump the armature to the bat, but I couldn't read the terminals on the regulator, and I couldn't get any kind of spark or reaction on the generator no matter what I jumped. Could have been too much insulation on the terminals from age and corrosion or who knows. I tried for about a half hour with no luck before pulling the top off the regulator.

    Now if I can figure out why she only hits on 2 cylinders when cold until warmed up for about 5 minutes I'll be doing good.

  4. #24
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Reversed battery polarity on 8N

    That's why i said to forget the regulator and trying to read it.. do the polerization from bat to arm at the generator.. Easy to determine which post is the armature...

    One big post on back with an insulated washer.

    2 small posts on the barrell, one common to the barrell, one with a phenolic washer.

    non insulated post is obviously ground.

    of the small and large insulated posts, armature will the the larger of the 2.. leaving.. field as the small insulated post.

    jumping from armature on the back of the genny, to battery hot, is electrically the same as doing it at the genny...

    soundguy


    Quote Originally Posted by kleake View Post
    Well, I was meaning to say it seems odd to most people, and a little to me because I do electronics as in the internals of monitors, power supply's, and just general things, but I haven't messed much in the old car/truck/tractor world with generators.

    I tried to jump the armature to the bat, but I couldn't read the terminals on the regulator, and I couldn't get any kind of spark or reaction on the generator no matter what I jumped. Could have been too much insulation on the terminals from age and corrosion or who knows. I tried for about a half hour with no luck before pulling the top off the regulator.

    Now if I can figure out why she only hits on 2 cylinders when cold until warmed up for about 5 minutes I'll be doing good.

  5. #25
    Member
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    Location
    Rutland UK
    Tractor
    MF135

    Default Re: Reversed battery polarity on 8N

    Word of wisdom
    It is possible to reverse charge a battery
    Happend on my Brother in laws car a ford fiesta fuel injected xr2i
    he couldnt understand why the new battery kept sparking when he tried to connnect it and all the lights came on

    As control systems sparky and ex auto electric and mech fitter,
    I checked it out for him and same thing happened. Took all the fuses out as thought there was a short and pulled the alt plug as well
    Only when I checked the battery voltage did i twig what was happening
    Battery was reverse charged

    Contacted the garage that supplied it to him, but they wouldnt believe it was possible
    I believe it happend thus. BIL buys battery, fits but faulty heated window relay flattens battery completely, takes back and they charge it using high current starter/ charger connected wrong giving him it back reverese charged
    Damage was "just" fuel injecton parts and electronic ignition.
    ECU radio and Alternator were fine
    so cost him about 50 quid
    Amazingly the battery recharged correctly once drained flat

    Note that reverse charging can only happen if battery is totaly discharged and charger conncted in reverse has a very high output

    Must say i have never checked polarity with a meter before connecting but I do now!!

  6. #26
    J_J
    J_J is online now
    Super Star Member J_J's Avatar
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    JACKSONVILLE, FL
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Reversed battery polarity on 8N

    Most good chargers will warn you with a buzzer if connected wrong. And no, I have never seen or heard of a battery reversed charged.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  7. #27
    Super Member RickB's Avatar
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    Eastern NY
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    Case 885, JD 730D, Ford 4000

    Default Re: Reversed battery polarity on 8N

    Quote Originally Posted by J_J View Post
    Most good chargers will warn you with a buzzer if connected wrong. And no, I have never seen or heard of a battery reversed charged.
    I have. It can and does happen once in a while.
    We have too much gun control.
    What we need is more idiot control.

  8. #28
    Member
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    Rutland UK
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    MF135

    Default Re: Reversed battery polarity on 8N

    Quote Originally Posted by J_J View Post
    Most good chargers will warn you with a buzzer if connected wrong. And no, I have never seen or heard of a battery reversed charged.
    As i ssaid, it can only happen if the battery is completey discharged so you wont get a warning. However, doemstic chargers wont normally have enough current to start the reverse charge process

  9. #29
    New Member
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    Mar 2013
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    Location
    Burleson, Texas
    Tractor
    1948 Ford 8N

    Default Re: Reversed battery polarity on 8N

    I did same recently on my 8N. Started fine, I saw ammeter spark and peg all the way to the right. Shut off tractor and took battery cables off. Have not touched since. System is 12v with alternator. Should I just put battery back in and hook up correctly (positive to starter/solenoid and negative to frame) and see what happens or are there some tests I can perform before hooking battery back up - to keep damage to a minimum. I'm a newbie so be kind.

  10. #30
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Reversed battery polarity on 8N

    at this point.. hook it up and test it... most likely the alternator is shot...

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