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Thread: lr503 - lr505

  1. #1

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    lr503 - lr505

    do any one know can I replace lr503 with lr505 in electric box ?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    What model and year is your Polaris watercraft?

    LR-503 and LR-505 have some differences.

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    its 1999 ficht

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    genessis

  5. #5

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    the lr503 stopped charging I did try lr505 but start stop wont work

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by alunboy View Post
    its 1999 ficht
    1999 Genesis FFI battery charging is not controlled by LR-503.

    The EMM controls battery charging on all Ficht engines.

  7. #7

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    i replaced the lr 503 due to not charging it worked for a bit stopped charging again showing on display 13.5 but on multimeter there is no change in voltage !!

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by alunboy View Post
    i replaced the lr 503 due to not charging it worked for a bit stopped charging again

    showing on display 13.5 but on multimeter there is no change in voltage !!
    LR module has nothing to do with battery charging on Ficht engines.

    The EMM most likely needs repair.

    The voltage shown on the MFI display may be inaccurate. There is a calibration process documented that shows how to make the MFI display show more accurate voltage readings.

  9. #9

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    emm is that the capasitor looking object ? or is it the main unit

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by alunboy View Post
    emm is that the capacitor looking object ? or is it the main unit
    The Ficht EMM is the large rectangular module with three large wire harness connections, plus two small water cooling hoses.

    Almost everything on a Ficht engine is controlled by the EMM.

    The only external electronic module is the Start/Stop LR module on Virage/Genesis and the ESP steering assist module on MSX 140.

    See my signature links for more info

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