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  1. #11
    Epic Contributor Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Ford 640 12 Volt Conversion Clean Up

    first determine if the ammeter is even hooked up correctly.

    alt charge stud to one sode of amp meter.

    wire that runs key switch and wire that runs lamps also on that side of the ammeter.

    other side fo the ammeter tot he battery.

    that gives you net charge / discharge.

    the 500 rpm turn on sounds ok. most of them turn on about 350+ depending on pulley size..e tc.

    a volt meter vest on bat before start, and then at throttle with 194 lamp off will tell you if the battery is being charged... irreguardless if the ammeter is hooekd up correctly.

    most ammeters today are shunt voltmeters.. iven if they don't read.. they usually pass current thru the shunt.

    post back

  2. #12
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    Jul 2011
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    Holladay, TN
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    1955 Ford 640

    Default Re: Ford 640 12 Volt Conversion Clean Up

    That was fast! I'm headed on a trip for a week so it will be a week from Saturday before I get back there. I'll give that a try. Thanks so much for the help.

    Steve
    Steve

    1955 Ford 640 - Old Dirt needs an Old Tractor

  3. #13
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Ford 640 12 Volt Conversion Clean Up

    i'm mobile.. so I check in all day... 4-5 days a week, and a few times on the weekend..

  4. #14
    New Member
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    Holladay, TN
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    1955 Ford 640

    Default Re: Ford 640 12 Volt Conversion Clean Up

    Quote Originally Posted by Soundguy View Post
    first determine if the ammeter is even hooked up correctly.

    alt charge stud to one sode of amp meter.

    wire that runs key switch and wire that runs lamps also on that side of the ammeter.

    other side fo the ammeter tot he battery.

    that gives you net charge / discharge.

    the 500 rpm turn on sounds ok. most of them turn on about 350+ depending on pulley size..e tc.

    a volt meter vest on bat before start, and then at throttle with 194 lamp off will tell you if the battery is being charged... irreguardless if the ammeter is hooekd up correctly.

    most ammeters today are shunt voltmeters.. iven if they don't read.. they usually pass current thru the shunt.

    post back
    Well, SG, you were exactly right. I checked the wiring and it was right. So I fired it up. At 350 RMP (light barely glowing) it was at about 13.6 Volts. Passing 450 it rose to 14.7 Volts acorss the terminals and stayed there. So, the gauge is bad and the charging system is working just fine. Thanks for all the help.
    Steve

    1955 Ford 640 - Old Dirt needs an Old Tractor

  5. #15
    Epic Contributor Soundguy's Avatar
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Ford 640 12 Volt Conversion Clean Up

    cool deal.

    those ammeters are usually shunt voltmeters.

    this means the shunt is intact.. and the meter movement is simply bad.

    easy to R&R


    best of luck

  6. #16
    New Member
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    1955 Ford 640

    Default Re: Ford 640 12 Volt Conversion Clean Up

    Ran great and helped me spread 12 tons of lime before the rain came in. But the liming is DONE! Love that little ol' tractor.
    Steve

    1955 Ford 640 - Old Dirt needs an Old Tractor

  7. #17
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Ford 640 12 Volt Conversion Clean Up

    the 55-64 years are my favorite fords.. and of those.. the rowcrops.. etc..

  8. #18
    New Member
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    1955 Ford 640

    Default Re: Ford 640 12 Volt Conversion Clean Up

    Quote Originally Posted by Soundguy View Post
    the 55-64 years are my favorite fords.. and of those.. the rowcrops.. etc..
    I was surprised when I ran my serial number (#2190) and it turns out to be a 1954. They actually started the 600 series late that year so it's an early one. I've had it for just 3 years but it's a workhorse. I only have 52 acres but it's great for my place.

    Now I have to fix the shaft on the gang of discs I just bent!
    Steve

    1955 Ford 640 - Old Dirt needs an Old Tractor

  9. #19
    Epic Contributor Soundguy's Avatar
    Join Date
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Ford 640 12 Volt Conversion Clean Up

    yep.. I simply refer to them by model years.

    otherwise.. you tell someone you have a 52 ford and they think 8n, not an early NAA... etc...

    Quote Originally Posted by RedDawg View Post
    I was surprised when I ran my serial number (#2190) and it turns out to be a 1954. They actually started the 600 series late that year so it's an early one. I've had it for just 3 years but it's a workhorse. I only have 52 acres but it's great for my place.

    Now I have to fix the shaft on the gang of discs I just bent!

  10. #20
    New Member
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    1955 Ford 640

    Default Re: Ford 640 12 Volt Conversion Clean Up

    Oh I understand. I was just surprised by how early this one was.
    Steve

    1955 Ford 640 - Old Dirt needs an Old Tractor

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