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  1. #1
    Silver Member tractorworks's Avatar
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    South Mississippi
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    B 2910 HSD, B2150 HST, G1800, Farmtrac 300DTC, Grasshopper 721D, JD 455

    Default John Deere 455 Alternator

    I have to replace alternator (magneto) and need to know how difficult it is to upgrade to 40 amp alternator (over 20 amp magneto.) The alternator is more readily available and therefor cheaper. Is there any reason not to go 40 amp and what is involved to change over?
    Thanks
    Doug
    tractorworks

  2. #2
    Veteran Member mostly_gas's Avatar
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    Missouri
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    1979 ford 1700 MFWD

    Default Re: John Deere 455 Alternator

    If the regulator is solid state or circuit board then there should be no problems. Not sure on the mechanical regulator type , my guess is that it would wear faster regulating the higher capacity.
    On the actual changeover, most alternators are built with different capacities and the same configuration ie wires and bolt holes etc. An auto parts store with a knowledgeable staff can tell you which one to get or given enough details such as the alternator model number someone on the network can tell you which alternator to get. Then it is an unbolt the old one and bolt the new one on. Should you start using the increase in power output, then you may need to upgrade portions of your tractor wiring, hard to say which ones without schematics.

  3. #3
    Silver Member tractorworks's Avatar
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    157
    Location
    South Mississippi
    Tractor
    B 2910 HSD, B2150 HST, G1800, Farmtrac 300DTC, Grasshopper 721D, JD 455

    Default Re: John Deere 455 Alternator

    Got the job done using a dynamo from Hoye tractor-seems to work fine. Same part from deere was twice as much.
    Thanks
    Yanmar Tractor Parts: ALTERNATOR - (DYNAMO)
    tractorworks

  4. #4
    Super Star Member
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    Upper Midwest USA
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    JD 4300, JD X485 JD 4x2 Gator, JD 425, JD455

    Default Re: John Deere 455 Alternator

    Meaning you switched to the 40 amp alternator?

  5. #5
    Silver Member tractorworks's Avatar
    Join Date
    Dec 2002
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    157
    Location
    South Mississippi
    Tractor
    B 2910 HSD, B2150 HST, G1800, Farmtrac 300DTC, Grasshopper 721D, JD 455

    Default Re: John Deere 455 Alternator

    No, I went with the dynamo (same thing I took off). I had seen alternators that looked like the same plug but kept hearing it wasn't a direct hookup because of the voltage regulator.
    tractorworks

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